publicdata/nist-gov
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
nist-gov/www.nist.gov/ncnr/data-reduction-analysis/reflectometry-software
Scott Williams 4063bef310 Initital commit.
2025-03-05 18:59:57 +00:00

1286 lines
103 KiB
Text
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

<!DOCTYPE html>
<html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# ">
<head>
<meta charset="utf-8" /><script type="text/javascript">(window.NREUM||(NREUM={})).init={ajax:{deny_list:["bam.nr-data.net"]}};(window.NREUM||(NREUM={})).loader_config={licenseKey:"37b7ccb661",applicationID:"1089704227"};;/*! For license information please see nr-loader-rum-1.283.2.min.js.LICENSE.txt */
(()=>{var e,t,r={122:(e,t,r)=>{"use strict";r.d(t,{a:()=>i});var n=r(944);function i(e,t){try{if(!e||"object"!=typeof e)return(0,n.R)(3);if(!t||"object"!=typeof t)return(0,n.R)(4);const r=Object.create(Object.getPrototypeOf(t),Object.getOwnPropertyDescriptors(t)),o=0===Object.keys(r).length?e:r;for(let a in o)if(void 0!==e[a])try{if(null===e[a]){r[a]=null;continue}Array.isArray(e[a])&&Array.isArray(t[a])?r[a]=Array.from(new Set([...e[a],...t[a]])):"object"==typeof e[a]&&"object"==typeof t[a]?r[a]=i(e[a],t[a]):r[a]=e[a]}catch(e){(0,n.R)(1,e)}return r}catch(e){(0,n.R)(2,e)}}},555:(e,t,r)=>{"use strict";r.d(t,{Vp:()=>c,fn:()=>s,x1:()=>u});var n=r(384),i=r(122);const o={beacon:n.NT.beacon,errorBeacon:n.NT.errorBeacon,licenseKey:void 0,applicationID:void 0,sa:void 0,queueTime:void 0,applicationTime:void 0,ttGuid:void 0,user:void 0,account:void 0,product:void 0,extra:void 0,jsAttributes:{},userAttributes:void 0,atts:void 0,transactionName:void 0,tNamePlain:void 0},a={};function s(e){try{const t=c(e);return!!t.licenseKey&&!!t.errorBeacon&&!!t.applicationID}catch(e){return!1}}function c(e){if(!e)throw new Error("All info objects require an agent identifier!");if(!a[e])throw new Error("Info for ".concat(e," was never set"));return a[e]}function u(e,t){if(!e)throw new Error("All info objects require an agent identifier!");a[e]=(0,i.a)(t,o);const r=(0,n.nY)(e);r&&(r.info=a[e])}},217:(e,t,r)=>{"use strict";r.d(t,{D0:()=>m,gD:()=>v,xN:()=>h});r(860).K7.genericEvents;const n="experimental.marks",i="experimental.measures",o="experimental.resources",a=e=>{if(!e||"string"!=typeof e)return!1;try{document.createDocumentFragment().querySelector(e)}catch{return!1}return!0};var s=r(614),c=r(944),u=r(384),l=r(122);const d="[data-nr-mask]",f=()=>{const e={feature_flags:[],experimental:{marks:!1,measures:!1,resources:!1},mask_selector:"*",block_selector:"[data-nr-block]",mask_input_options:{color:!1,date:!1,"datetime-local":!1,email:!1,month:!1,number:!1,range:!1,search:!1,tel:!1,text:!1,time:!1,url:!1,week:!1,textarea:!1,select:!1,password:!0}};return{ajax:{deny_list:void 0,block_internal:!0,enabled:!0,autoStart:!0},distributed_tracing:{enabled:void 0,exclude_newrelic_header:void 0,cors_use_newrelic_header:void 0,cors_use_tracecontext_headers:void 0,allowed_origins:void 0},get feature_flags(){return e.feature_flags},set feature_flags(t){e.feature_flags=t},generic_events:{enabled:!0,autoStart:!0},harvest:{interval:30},jserrors:{enabled:!0,autoStart:!0},logging:{enabled:!0,autoStart:!0},metrics:{enabled:!0,autoStart:!0},obfuscate:void 0,page_action:{enabled:!0},page_view_event:{enabled:!0,autoStart:!0},page_view_timing:{enabled:!0,autoStart:!0},performance:{get capture_marks(){return e.feature_flags.includes(n)||e.experimental.marks},set capture_marks(t){e.experimental.marks=t},get capture_measures(){return e.feature_flags.includes(i)||e.experimental.measures},set capture_measures(t){e.experimental.measures=t},capture_detail:!0,resources:{get enabled(){return e.feature_flags.includes(o)||e.experimental.resources},set enabled(t){e.experimental.resources=t},asset_types:[],first_party_domains:[],ignore_newrelic:!0}},privacy:{cookies_enabled:!0},proxy:{assets:void 0,beacon:void 0},session:{expiresMs:s.wk,inactiveMs:s.BB},session_replay:{autoStart:!0,enabled:!1,preload:!1,sampling_rate:10,error_sampling_rate:100,collect_fonts:!1,inline_images:!1,fix_stylesheets:!0,mask_all_inputs:!0,get mask_text_selector(){return e.mask_selector},set mask_text_selector(t){a(t)?e.mask_selector="".concat(t,",").concat(d):""===t||null===t?e.mask_selector=d:(0,c.R)(5,t)},get block_class(){return"nr-block"},get ignore_class(){return"nr-ignore"},get mask_text_class(){return"nr-mask"},get block_selector(){return e.block_selector},set block_selector(t){a(t)?e.block_selector+=",".concat(t):""!==t&&(0,c.R)(6,t)},get mask_input_options(){return e.mask_input_options},set mask_input_options(t){t&&"object"==typeof t?e.mask_input_options={...t,password:!0}:(0,c.R)(7,t)}},session_trace:{enabled:!0,autoStart:!0},soft_navigations:{enabled:!0,autoStart:!0},spa:{enabled:!0,autoStart:!0},ssl:void 0,user_actions:{enabled:!0,elementAttributes:["id","className","tagName","type"]}}},g={},p="All configuration objects require an agent identifier!";function m(e){if(!e)throw new Error(p);if(!g[e])throw new Error("Configuration for ".concat(e," was never set"));return g[e]}function h(e,t){if(!e)throw new Error(p);g[e]=(0,l.a)(t,f());const r=(0,u.nY)(e);r&&(r.init=g[e])}function v(e,t){if(!e)throw new Error(p);var r=m(e);if(r){for(var n=t.split("."),i=0;i<n.length-1;i++)if("object"!=typeof(r=r[n[i]]))return;r=r[n[n.length-1]]}return r}},371:(e,t,r)=>{"use strict";r.d(t,{V:()=>f,f:()=>d});var n=r(122),i=r(384),o=r(154),a=r(324);let s=0;const c={buildEnv:a.F3,distMethod:a.Xs,version:a.xv,originTime:o.WN},u={customTransaction:void 0,disabled:!1,isolatedBacklog:!1,loaderType:void 0,maxBytes:3e4,onerror:void 0,ptid:void 0,releaseIds:{},appMetadata:{},session:void 0,denyList:void 0,timeKeeper:void 0,obfuscator:void 0,harvester:void 0},l={};function d(e){if(!e)throw new Error("All runtime objects require an agent identifier!");if(!l[e])throw new Error("Runtime for ".concat(e," was never set"));return l[e]}function f(e,t){if(!e)throw new Error("All runtime objects require an agent identifier!");l[e]={...(0,n.a)(t,u),...c},Object.hasOwnProperty.call(l[e],"harvestCount")||Object.defineProperty(l[e],"harvestCount",{get:()=>++s});const r=(0,i.nY)(e);r&&(r.runtime=l[e])}},324:(e,t,r)=>{"use strict";r.d(t,{F3:()=>i,Xs:()=>o,xv:()=>n});const n="1.283.2",i="PROD",o="CDN"},154:(e,t,r)=>{"use strict";r.d(t,{OF:()=>c,RI:()=>i,WN:()=>l,bv:()=>o,gm:()=>a,mw:()=>s,sb:()=>u});var n=r(863);const i="undefined"!=typeof window&&!!window.document,o="undefined"!=typeof WorkerGlobalScope&&("undefined"!=typeof self&&self instanceof WorkerGlobalScope&&self.navigator instanceof WorkerNavigator||"undefined"!=typeof globalThis&&globalThis instanceof WorkerGlobalScope&&globalThis.navigator instanceof WorkerNavigator),a=i?window:"undefined"!=typeof WorkerGlobalScope&&("undefined"!=typeof self&&self instanceof WorkerGlobalScope&&self||"undefined"!=typeof globalThis&&globalThis instanceof WorkerGlobalScope&&globalThis),s=Boolean("hidden"===a?.document?.visibilityState),c=/iPad|iPhone|iPod/.test(a.navigator?.userAgent),u=c&&"undefined"==typeof SharedWorker,l=((()=>{const e=a.navigator?.userAgent?.match(/Firefox[/\s](\d+\.\d+)/);Array.isArray(e)&&e.length>=2&&e[1]})(),Date.now()-(0,n.t)())},687:(e,t,r)=>{"use strict";r.d(t,{Ak:()=>c,Ze:()=>d,x3:()=>u});var n=r(836),i=r(606),o=r(860),a=r(646);const s={};function c(e,t){const r={staged:!1,priority:o.P3[t]||0};l(e),s[e].get(t)||s[e].set(t,r)}function u(e,t){e&&s[e]&&(s[e].get(t)&&s[e].delete(t),g(e,t,!1),s[e].size&&f(e))}function l(e){if(!e)throw new Error("agentIdentifier required");s[e]||(s[e]=new Map)}function d(e="",t="feature",r=!1){if(l(e),!e||!s[e].get(t)||r)return g(e,t);s[e].get(t).staged=!0,f(e)}function f(e){const t=Array.from(s[e]);t.every((([e,t])=>t.staged))&&(t.sort(((e,t)=>e[1].priority-t[1].priority)),t.forEach((([t])=>{s[e].delete(t),g(e,t)})))}function g(e,t,r=!0){const o=e?n.ee.get(e):n.ee,s=i.i.handlers;if(!o.aborted&&o.backlog&&s){if(r){const e=o.backlog[t],r=s[t];if(r){for(let t=0;e&&t<e.length;++t)p(e[t],r);Object.entries(r).forEach((([e,t])=>{Object.values(t||{}).forEach((t=>{t[0]?.on&&t[0]?.context()instanceof a.y&&t[0].on(e,t[1])}))}))}}o.isolatedBacklog||delete s[t],o.backlog[t]=null,o.emit("drain-"+t,[])}}function p(e,t){var r=e[1];Object.values(t[r]||{}).forEach((t=>{var r=e[0];if(t[0]===r){var n=t[1],i=e[3],o=e[2];n.apply(i,o)}}))}},836:(e,t,r)=>{"use strict";r.d(t,{P:()=>c,ee:()=>u});var n=r(384),i=r(990),o=r(371),a=r(646),s=r(607);const c="nr@context:".concat(s.W),u=function e(t,r){var n={},s={},l={},d=!1;try{d=16===r.length&&(0,o.f)(r).isolatedBacklog}catch(e){}var f={on:p,addEventListener:p,removeEventListener:function(e,t){var r=n[e];if(!r)return;for(var i=0;i<r.length;i++)r[i]===t&&r.splice(i,1)},emit:function(e,r,n,i,o){!1!==o&&(o=!0);if(u.aborted&&!i)return;t&&o&&t.emit(e,r,n);for(var a=g(n),c=m(e),l=c.length,d=0;d<l;d++)c[d].apply(a,r);var p=v()[s[e]];p&&p.push([f,e,r,a]);return a},get:h,listeners:m,context:g,buffer:function(e,t){const r=v();if(t=t||"feature",f.aborted)return;Object.entries(e||{}).forEach((([e,n])=>{s[n]=t,t in r||(r[t]=[])}))},abort:function(){f._aborted=!0,Object.keys(f.backlog).forEach((e=>{delete f.backlog[e]}))},isBuffering:function(e){return!!v()[s[e]]},debugId:r,backlog:d?{}:t&&"object"==typeof t.backlog?t.backlog:{},isolatedBacklog:d};return Object.defineProperty(f,"aborted",{get:()=>{let e=f._aborted||!1;return e||(t&&(e=t.aborted),e)}}),f;function g(e){return e&&e instanceof a.y?e:e?(0,i.I)(e,c,(()=>new a.y(c))):new a.y(c)}function p(e,t){n[e]=m(e).concat(t)}function m(e){return n[e]||[]}function h(t){return l[t]=l[t]||e(f,t)}function v(){return f.backlog}}(void 0,"globalEE"),l=(0,n.Zm)();l.ee||(l.ee=u)},646:(e,t,r)=>{"use strict";r.d(t,{y:()=>n});class n{constructor(e){this.contextId=e}}},908:(e,t,r)=>{"use strict";r.d(t,{d:()=>n,p:()=>i});var n=r(836).ee.get("handle");function i(e,t,r,i,o){o?(o.buffer([e],i),o.emit(e,t,r)):(n.buffer([e],i),n.emit(e,t,r))}},606:(e,t,r)=>{"use strict";r.d(t,{i:()=>o});var n=r(908);o.on=a;var i=o.handlers={};function o(e,t,r,o){a(o||n.d,i,e,t,r)}function a(e,t,r,i,o){o||(o="feature"),e||(e=n.d);var a=t[o]=t[o]||{};(a[r]=a[r]||[]).push([e,i])}},878:(e,t,r)=>{"use strict";function n(e,t){return{capture:e,passive:!1,signal:t}}function i(e,t,r=!1,i){window.addEventListener(e,t,n(r,i))}function o(e,t,r=!1,i){document.addEventListener(e,t,n(r,i))}r.d(t,{DD:()=>o,jT:()=>n,sp:()=>i})},607:(e,t,r)=>{"use strict";r.d(t,{W:()=>n});const n=(0,r(566).bz)()},566:(e,t,r)=>{"use strict";r.d(t,{LA:()=>s,bz:()=>a});var n=r(154);const i="xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx";function o(e,t){return e?15&e[t]:16*Math.random()|0}function a(){const e=n.gm?.crypto||n.gm?.msCrypto;let t,r=0;return e&&e.getRandomValues&&(t=e.getRandomValues(new Uint8Array(30))),i.split("").map((e=>"x"===e?o(t,r++).toString(16):"y"===e?(3&o()|8).toString(16):e)).join("")}function s(e){const t=n.gm?.crypto||n.gm?.msCrypto;let r,i=0;t&&t.getRandomValues&&(r=t.getRandomValues(new Uint8Array(e)));const a=[];for(var s=0;s<e;s++)a.push(o(r,i++).toString(16));return a.join("")}},614:(e,t,r)=>{"use strict";r.d(t,{BB:()=>a,H3:()=>n,g:()=>u,iL:()=>c,tS:()=>s,uh:()=>i,wk:()=>o});const n="NRBA",i="SESSION",o=144e5,a=18e5,s={STARTED:"session-started",PAUSE:"session-pause",RESET:"session-reset",RESUME:"session-resume",UPDATE:"session-update"},c={SAME_TAB:"same-tab",CROSS_TAB:"cross-tab"},u={OFF:0,FULL:1,ERROR:2}},863:(e,t,r)=>{"use strict";function n(){return Math.floor(performance.now())}r.d(t,{t:()=>n})},944:(e,t,r)=>{"use strict";function n(e,t){"function"==typeof console.debug&&console.debug("New Relic Warning: https://github.com/newrelic/newrelic-browser-agent/blob/main/docs/warning-codes.md#".concat(e),t)}r.d(t,{R:()=>n})},284:(e,t,r)=>{"use strict";r.d(t,{t:()=>c,B:()=>s});var n=r(836),i=r(154);const o="newrelic";const a=new Set,s={};function c(e,t){const r=n.ee.get(t);s[t]??={},e&&"object"==typeof e&&(a.has(t)||(r.emit("rumresp",[e]),s[t]=e,a.add(t),function(e={}){try{i.gm.dispatchEvent(new CustomEvent(o,{detail:e}))}catch(e){}}({loaded:!0})))}},990:(e,t,r)=>{"use strict";r.d(t,{I:()=>i});var n=Object.prototype.hasOwnProperty;function i(e,t,r){if(n.call(e,t))return e[t];var i=r();if(Object.defineProperty&&Object.keys)try{return Object.defineProperty(e,t,{value:i,writable:!0,enumerable:!1}),i}catch(e){}return e[t]=i,i}},389:(e,t,r)=>{"use strict";function n(e,t=500,r={}){const n=r?.leading||!1;let i;return(...r)=>{n&&void 0===i&&(e.apply(this,r),i=setTimeout((()=>{i=clearTimeout(i)}),t)),n||(clearTimeout(i),i=setTimeout((()=>{e.apply(this,r)}),t))}}function i(e){let t=!1;return(...r)=>{t||(t=!0,e.apply(this,r))}}r.d(t,{J:()=>i,s:()=>n})},289:(e,t,r)=>{"use strict";r.d(t,{GG:()=>o,sB:()=>a});var n=r(878);function i(){return"undefined"==typeof document||"complete"===document.readyState}function o(e,t){if(i())return e();(0,n.sp)("load",e,t)}function a(e){if(i())return e();(0,n.DD)("DOMContentLoaded",e)}},384:(e,t,r)=>{"use strict";r.d(t,{NT:()=>o,US:()=>l,Zm:()=>a,bQ:()=>c,dV:()=>s,nY:()=>u,pV:()=>d});var n=r(154),i=r(863);const o={beacon:"bam.nr-data.net",errorBeacon:"bam.nr-data.net"};function a(){return n.gm.NREUM||(n.gm.NREUM={}),void 0===n.gm.newrelic&&(n.gm.newrelic=n.gm.NREUM),n.gm.NREUM}function s(){let e=a();return e.o||(e.o={ST:n.gm.setTimeout,SI:n.gm.setImmediate,CT:n.gm.clearTimeout,XHR:n.gm.XMLHttpRequest,REQ:n.gm.Request,EV:n.gm.Event,PR:n.gm.Promise,MO:n.gm.MutationObserver,FETCH:n.gm.fetch,WS:n.gm.WebSocket}),e}function c(e,t){let r=a();r.initializedAgents??={},t.initializedAt={ms:(0,i.t)(),date:new Date},r.initializedAgents[e]=t}function u(e){let t=a();return t.initializedAgents?.[e]}function l(e,t){a()[e]=t}function d(){return function(){let e=a();const t=e.info||{};e.info={beacon:o.beacon,errorBeacon:o.errorBeacon,...t}}(),function(){let e=a();const t=e.init||{};e.init={...t}}(),s(),function(){let e=a();const t=e.loader_config||{};e.loader_config={...t}}(),a()}},843:(e,t,r)=>{"use strict";r.d(t,{u:()=>i});var n=r(878);function i(e,t=!1,r,i){(0,n.DD)("visibilitychange",(function(){if(t)return void("hidden"===document.visibilityState&&e());e(document.visibilityState)}),r,i)}},434:(e,t,r)=>{"use strict";r.d(t,{Jt:()=>o,YM:()=>c});var n=r(836),i=r(607);const o="nr@original:".concat(i.W);var a=Object.prototype.hasOwnProperty,s=!1;function c(e,t){return e||(e=n.ee),r.inPlace=function(e,t,n,i,o){n||(n="");const a="-"===n.charAt(0);for(let s=0;s<t.length;s++){const c=t[s],u=e[c];l(u)||(e[c]=r(u,a?c+n:n,i,c,o))}},r.flag=o,r;function r(t,r,n,s,c){return l(t)?t:(r||(r=""),nrWrapper[o]=t,function(e,t,r){if(Object.defineProperty&&Object.keys)try{return Object.keys(e).forEach((function(r){Object.defineProperty(t,r,{get:function(){return e[r]},set:function(t){return e[r]=t,t}})})),t}catch(e){u([e],r)}for(var n in e)a.call(e,n)&&(t[n]=e[n])}(t,nrWrapper,e),nrWrapper);function nrWrapper(){var o,a,l,d;try{a=this,o=[...arguments],l="function"==typeof n?n(o,a):n||{}}catch(t){u([t,"",[o,a,s],l],e)}i(r+"start",[o,a,s],l,c);try{return d=t.apply(a,o)}catch(e){throw i(r+"err",[o,a,e],l,c),e}finally{i(r+"end",[o,a,d],l,c)}}}function i(r,n,i,o){if(!s||t){var a=s;s=!0;try{e.emit(r,n,i,t,o)}catch(t){u([t,r,n,i],e)}s=a}}}function u(e,t){t||(t=n.ee);try{t.emit("internal-error",e)}catch(e){}}function l(e){return!(e&&"function"==typeof e&&e.apply&&!e[o])}},993:(e,t,r)=>{"use strict";r.d(t,{A$:()=>o,ET:()=>a,p_:()=>i});var n=r(860);const i={ERROR:"ERROR",WARN:"WARN",INFO:"INFO",DEBUG:"DEBUG",TRACE:"TRACE"},o={OFF:0,ERROR:1,WARN:2,INFO:3,DEBUG:4,TRACE:5},a="log";n.K7.logging},773:(e,t,r)=>{"use strict";r.d(t,{z_:()=>o,XG:()=>s,TZ:()=>n,rs:()=>i,xV:()=>a});r(154),r(566),r(384);const n=r(860).K7.metrics,i="sm",o="cm",a="storeSupportabilityMetrics",s="storeEventMetrics"},630:(e,t,r)=>{"use strict";r.d(t,{T:()=>n});const n=r(860).K7.pageViewEvent},782:(e,t,r)=>{"use strict";r.d(t,{T:()=>n});const n=r(860).K7.pageViewTiming},344:(e,t,r)=>{"use strict";r.d(t,{G4:()=>i});var n=r(614);r(860).K7.sessionReplay;const i={RECORD:"recordReplay",PAUSE:"pauseReplay",REPLAY_RUNNING:"replayRunning",ERROR_DURING_REPLAY:"errorDuringReplay"};n.g.ERROR,n.g.FULL,n.g.OFF},234:(e,t,r)=>{"use strict";r.d(t,{W:()=>o});var n=r(836),i=r(687);class o{constructor(e,t){this.agentIdentifier=e,this.ee=n.ee.get(e),this.featureName=t,this.blocked=!1}deregisterDrain(){(0,i.x3)(this.agentIdentifier,this.featureName)}}},603:(e,t,r)=>{"use strict";r.d(t,{j:()=>K});var n=r(860),i=r(555),o=r(371),a=r(908),s=r(836),c=r(687),u=r(289),l=r(154),d=r(944),f=r(773),g=r(384),p=r(344);const m=["setErrorHandler","finished","addToTrace","addRelease","recordCustomEvent","addPageAction","setCurrentRouteName","setPageViewName","setCustomAttribute","interaction","noticeError","setUserId","setApplicationVersion","start",p.G4.RECORD,p.G4.PAUSE,"log","wrapLogger"],h=["setErrorHandler","finished","addToTrace","addRelease"];var v=r(863),b=r(614),y=r(993);var w=r(646),R=r(434);const A=new Map;function E(e,t,r,n){if("object"!=typeof t||!t||"string"!=typeof r||!r||"function"!=typeof t[r])return(0,d.R)(29);const i=function(e){return(e||s.ee).get("logger")}(e),o=(0,R.YM)(i),a=new w.y(s.P);a.level=n.level,a.customAttributes=n.customAttributes;const c=t[r]?.[R.Jt]||t[r];return A.set(c,a),o.inPlace(t,[r],"wrap-logger-",(()=>A.get(c))),i}function _(){const e=(0,g.pV)();m.forEach((t=>{e[t]=(...r)=>function(t,...r){let n=[];return Object.values(e.initializedAgents).forEach((e=>{e&&e.api?e.exposed&&e.api[t]&&n.push(e.api[t](...r)):(0,d.R)(38,t)})),n.length>1?n:n[0]}(t,...r)}))}const x={};function N(e,t,g=!1){t||(0,c.Ak)(e,"api");const m={};var w=s.ee.get(e),R=w.get("tracer");x[e]=b.g.OFF,w.on(p.G4.REPLAY_RUNNING,(t=>{x[e]=t}));var A="api-",_=A+"ixn-";function N(t,r,n,o){const a=(0,i.Vp)(e);return null===r?delete a.jsAttributes[t]:(0,i.x1)(e,{...a,jsAttributes:{...a.jsAttributes,[t]:r}}),j(A,n,!0,o||null===r?"session":void 0)(t,r)}function k(){}m.log=function(e,{customAttributes:t={},level:r=y.p_.INFO}={}){(0,a.p)(f.xV,["API/log/called"],void 0,n.K7.metrics,w),function(e,t,r={},i=y.p_.INFO){(0,a.p)(f.xV,["API/logging/".concat(i.toLowerCase(),"/called")],void 0,n.K7.metrics,e),(0,a.p)(y.ET,[(0,v.t)(),t,r,i],void 0,n.K7.logging,e)}(w,e,t,r)},m.wrapLogger=(e,t,{customAttributes:r={},level:i=y.p_.INFO}={})=>{(0,a.p)(f.xV,["API/wrapLogger/called"],void 0,n.K7.metrics,w),E(w,e,t,{customAttributes:r,level:i})},h.forEach((e=>{m[e]=j(A,e,!0,"api")})),m.addPageAction=j(A,"addPageAction",!0,n.K7.genericEvents),m.recordCustomEvent=j(A,"recordCustomEvent",!0,n.K7.genericEvents),m.setPageViewName=function(t,r){if("string"==typeof t)return"/"!==t.charAt(0)&&(t="/"+t),(0,o.f)(e).customTransaction=(r||"http://custom.transaction")+t,j(A,"setPageViewName",!0)()},m.setCustomAttribute=function(e,t,r=!1){if("string"==typeof e){if(["string","number","boolean"].includes(typeof t)||null===t)return N(e,t,"setCustomAttribute",r);(0,d.R)(40,typeof t)}else(0,d.R)(39,typeof e)},m.setUserId=function(e){if("string"==typeof e||null===e)return N("enduser.id",e,"setUserId",!0);(0,d.R)(41,typeof e)},m.setApplicationVersion=function(e){if("string"==typeof e||null===e)return N("application.version",e,"setApplicationVersion",!1);(0,d.R)(42,typeof e)},m.start=()=>{try{(0,a.p)(f.xV,["API/start/called"],void 0,n.K7.metrics,w),w.emit("manual-start-all")}catch(e){(0,d.R)(23,e)}},m[p.G4.RECORD]=function(){(0,a.p)(f.xV,["API/recordReplay/called"],void 0,n.K7.metrics,w),(0,a.p)(p.G4.RECORD,[],void 0,n.K7.sessionReplay,w)},m[p.G4.PAUSE]=function(){(0,a.p)(f.xV,["API/pauseReplay/called"],void 0,n.K7.metrics,w),(0,a.p)(p.G4.PAUSE,[],void 0,n.K7.sessionReplay,w)},m.interaction=function(e){return(new k).get("object"==typeof e?e:{})};const T=k.prototype={createTracer:function(e,t){var r={},i=this,o="function"==typeof t;return(0,a.p)(f.xV,["API/createTracer/called"],void 0,n.K7.metrics,w),g||(0,a.p)(_+"tracer",[(0,v.t)(),e,r],i,n.K7.spa,w),function(){if(R.emit((o?"":"no-")+"fn-start",[(0,v.t)(),i,o],r),o)try{return t.apply(this,arguments)}catch(e){const t="string"==typeof e?new Error(e):e;throw R.emit("fn-err",[arguments,this,t],r),t}finally{R.emit("fn-end",[(0,v.t)()],r)}}}};function j(e,t,r,i){return function(){return(0,a.p)(f.xV,["API/"+t+"/called"],void 0,n.K7.metrics,w),i&&(0,a.p)(e+t,[r?(0,v.t)():performance.now(),...arguments],r?null:this,i,w),r?void 0:this}}function I(){r.e(296).then(r.bind(r,778)).then((({setAPI:t})=>{t(e),(0,c.Ze)(e,"api")})).catch((e=>{(0,d.R)(27,e),w.abort()}))}return["actionText","setName","setAttribute","save","ignore","onEnd","getContext","end","get"].forEach((e=>{T[e]=j(_,e,void 0,g?n.K7.softNav:n.K7.spa)})),m.setCurrentRouteName=g?j(_,"routeName",void 0,n.K7.softNav):j(A,"routeName",!0,n.K7.spa),m.noticeError=function(t,r){"string"==typeof t&&(t=new Error(t)),(0,a.p)(f.xV,["API/noticeError/called"],void 0,n.K7.metrics,w),(0,a.p)("err",[t,(0,v.t)(),!1,r,!!x[e]],void 0,n.K7.jserrors,w)},l.RI?(0,u.GG)((()=>I()),!0):I(),m}var k=r(217),T=r(122);const j={accountID:void 0,trustKey:void 0,agentID:void 0,licenseKey:void 0,applicationID:void 0,xpid:void 0},I={};var O=r(284);const S=e=>{const t=e.startsWith("http");e+="/",r.p=t?e:"https://"+e};let P=!1;function K(e,t={},r,n){let{init:a,info:c,loader_config:u,runtime:d={},exposed:f=!0}=t;d.loaderType=r;const p=(0,g.pV)();c||(a=p.init,c=p.info,u=p.loader_config),(0,k.xN)(e.agentIdentifier,a||{}),function(e,t){if(!e)throw new Error("All loader-config objects require an agent identifier!");I[e]=(0,T.a)(t,j);const r=(0,g.nY)(e);r&&(r.loader_config=I[e])}(e.agentIdentifier,u||{}),c.jsAttributes??={},l.bv&&(c.jsAttributes.isWorker=!0),(0,i.x1)(e.agentIdentifier,c);const m=(0,k.D0)(e.agentIdentifier),h=[c.beacon,c.errorBeacon];P||(m.proxy.assets&&(S(m.proxy.assets),h.push(m.proxy.assets)),m.proxy.beacon&&h.push(m.proxy.beacon),_(),(0,g.US)("activatedFeatures",O.B),e.runSoftNavOverSpa&&=!0===m.soft_navigations.enabled&&m.feature_flags.includes("soft_nav")),d.denyList=[...m.ajax.deny_list||[],...m.ajax.block_internal?h:[]],d.ptid=e.agentIdentifier,(0,o.V)(e.agentIdentifier,d),e.ee=s.ee.get(e.agentIdentifier),void 0===e.api&&(e.api=N(e.agentIdentifier,n,e.runSoftNavOverSpa)),void 0===e.exposed&&(e.exposed=f),P=!0}},374:(e,t,r)=>{r.nc=(()=>{try{return document?.currentScript?.nonce}catch(e){}return""})()},860:(e,t,r)=>{"use strict";r.d(t,{$J:()=>u,K7:()=>s,P3:()=>c,XX:()=>i,qY:()=>n,v4:()=>a});const n="events",i="jserrors",o="browser/blobs",a="rum",s={ajax:"ajax",genericEvents:"generic_events",jserrors:i,logging:"logging",metrics:"metrics",pageAction:"page_action",pageViewEvent:"page_view_event",pageViewTiming:"page_view_timing",sessionReplay:"session_replay",sessionTrace:"session_trace",softNav:"soft_navigations",spa:"spa"},c={[s.pageViewEvent]:1,[s.pageViewTiming]:2,[s.metrics]:3,[s.jserrors]:4,[s.spa]:5,[s.ajax]:6,[s.sessionTrace]:7,[s.softNav]:8,[s.sessionReplay]:9,[s.logging]:10,[s.genericEvents]:11},u={[s.pageViewEvent]:a,[s.pageViewTiming]:n,[s.ajax]:n,[s.spa]:n,[s.softNav]:n,[s.metrics]:i,[s.jserrors]:i,[s.sessionTrace]:o,[s.sessionReplay]:o,[s.logging]:"browser/logs",[s.genericEvents]:"ins"}}},n={};function i(e){var t=n[e];if(void 0!==t)return t.exports;var o=n[e]={exports:{}};return r[e](o,o.exports,i),o.exports}i.m=r,i.d=(e,t)=>{for(var r in t)i.o(t,r)&&!i.o(e,r)&&Object.defineProperty(e,r,{enumerable:!0,get:t[r]})},i.f={},i.e=e=>Promise.all(Object.keys(i.f).reduce(((t,r)=>(i.f[r](e,t),t)),[])),i.u=e=>"nr-rum-1.283.2.min.js",i.o=(e,t)=>Object.prototype.hasOwnProperty.call(e,t),e={},t="NRBA-1.283.2.PROD:",i.l=(r,n,o,a)=>{if(e[r])e[r].push(n);else{var s,c;if(void 0!==o)for(var u=document.getElementsByTagName("script"),l=0;l<u.length;l++){var d=u[l];if(d.getAttribute("src")==r||d.getAttribute("data-webpack")==t+o){s=d;break}}if(!s){c=!0;var f={296:"sha512-2Y8GMAOGF658KnXzOZ/v+DlLch8TBFvV0tTNnOy9wrpvtDa1t5CdZMyX+LubTymBlzPp6NUjllBghMCZqXBPmg=="};(s=document.createElement("script")).charset="utf-8",s.timeout=120,i.nc&&s.setAttribute("nonce",i.nc),s.setAttribute("data-webpack",t+o),s.src=r,0!==s.src.indexOf(window.location.origin+"/")&&(s.crossOrigin="anonymous"),f[a]&&(s.integrity=f[a])}e[r]=[n];var g=(t,n)=>{s.onerror=s.onload=null,clearTimeout(p);var i=e[r];if(delete e[r],s.parentNode&&s.parentNode.removeChild(s),i&&i.forEach((e=>e(n))),t)return t(n)},p=setTimeout(g.bind(null,void 0,{type:"timeout",target:s}),12e4);s.onerror=g.bind(null,s.onerror),s.onload=g.bind(null,s.onload),c&&document.head.appendChild(s)}},i.r=e=>{"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},i.p="https://js-agent.newrelic.com/",(()=>{var e={374:0,840:0};i.f.j=(t,r)=>{var n=i.o(e,t)?e[t]:void 0;if(0!==n)if(n)r.push(n[2]);else{var o=new Promise(((r,i)=>n=e[t]=[r,i]));r.push(n[2]=o);var a=i.p+i.u(t),s=new Error;i.l(a,(r=>{if(i.o(e,t)&&(0!==(n=e[t])&&(e[t]=void 0),n)){var o=r&&("load"===r.type?"missing":r.type),a=r&&r.target&&r.target.src;s.message="Loading chunk "+t+" failed.\n("+o+": "+a+")",s.name="ChunkLoadError",s.type=o,s.request=a,n[1](s)}}),"chunk-"+t,t)}};var t=(t,r)=>{var n,o,[a,s,c]=r,u=0;if(a.some((t=>0!==e[t]))){for(n in s)i.o(s,n)&&(i.m[n]=s[n]);if(c)c(i)}for(t&&t(r);u<a.length;u++)o=a[u],i.o(e,o)&&e[o]&&e[o][0](),e[o]=0},r=self["webpackChunk:NRBA-1.283.2.PROD"]=self["webpackChunk:NRBA-1.283.2.PROD"]||[];r.forEach(t.bind(null,0)),r.push=t.bind(null,r.push.bind(r))})(),(()=>{"use strict";i(374);var e=i(944),t=i(344),r=i(566);class n{agentIdentifier;constructor(){this.agentIdentifier=(0,r.LA)(16)}#e(t,...r){if("function"==typeof this.api?.[t])return this.api[t](...r);(0,e.R)(35,t)}addPageAction(e,t){return this.#e("addPageAction",e,t)}recordCustomEvent(e,t){return this.#e("recordCustomEvent",e,t)}setPageViewName(e,t){return this.#e("setPageViewName",e,t)}setCustomAttribute(e,t,r){return this.#e("setCustomAttribute",e,t,r)}noticeError(e,t){return this.#e("noticeError",e,t)}setUserId(e){return this.#e("setUserId",e)}setApplicationVersion(e){return this.#e("setApplicationVersion",e)}setErrorHandler(e){return this.#e("setErrorHandler",e)}addRelease(e,t){return this.#e("addRelease",e,t)}log(e,t){return this.#e("log",e,t)}}class o extends n{#e(t,...r){if("function"==typeof this.api?.[t])return this.api[t](...r);(0,e.R)(35,t)}start(){return this.#e("start")}finished(e){return this.#e("finished",e)}recordReplay(){return this.#e(t.G4.RECORD)}pauseReplay(){return this.#e(t.G4.PAUSE)}addToTrace(e){return this.#e("addToTrace",e)}setCurrentRouteName(e){return this.#e("setCurrentRouteName",e)}interaction(){return this.#e("interaction")}wrapLogger(e,t,r){return this.#e("wrapLogger",e,t,r)}}var a=i(860),s=i(217);const c=Object.values(a.K7);function u(e){const t={};return c.forEach((r=>{t[r]=function(e,t){return!0===(0,s.gD)(t,"".concat(e,".enabled"))}(r,e)})),t}var l=i(603);var d=i(687),f=i(234),g=i(289),p=i(154),m=i(384);const h=e=>p.RI&&!0===(0,s.gD)(e,"privacy.cookies_enabled");function v(e){return!!(0,m.dV)().o.MO&&h(e)&&!0===(0,s.gD)(e,"session_trace.enabled")}var b=i(389);class y extends f.W{constructor(e,t,r=!0){super(e.agentIdentifier,t),this.auto=r,this.abortHandler=void 0,this.featAggregate=void 0,this.onAggregateImported=void 0,!1===e.init[this.featureName].autoStart&&(this.auto=!1),this.auto?(0,d.Ak)(e.agentIdentifier,t):this.ee.on("manual-start-all",(0,b.J)((()=>{(0,d.Ak)(e.agentIdentifier,this.featureName),this.auto=!0,this.importAggregator(e)})))}importAggregator(t,r={}){if(this.featAggregate||!this.auto)return;let n;this.onAggregateImported=new Promise((e=>{n=e}));const o=async()=>{let o;try{if(h(this.agentIdentifier)){const{setupAgentSession:e}=await i.e(296).then(i.bind(i,861));o=e(t)}}catch(t){(0,e.R)(20,t),this.ee.emit("internal-error",[t]),this.featureName===a.K7.sessionReplay&&this.abortHandler?.()}try{if(!this.#t(this.featureName,o))return(0,d.Ze)(this.agentIdentifier,this.featureName),void n(!1);const{lazyFeatureLoader:e}=await i.e(296).then(i.bind(i,103)),{Aggregate:a}=await e(this.featureName,"aggregate");this.featAggregate=new a(t,r),t.runtime.harvester.initializedAggregates.push(this.featAggregate),n(!0)}catch(t){(0,e.R)(34,t),this.abortHandler?.(),(0,d.Ze)(this.agentIdentifier,this.featureName,!0),n(!1),this.ee&&this.ee.abort()}};p.RI?(0,g.GG)((()=>o()),!0):o()}#t(e,t){switch(e){case a.K7.sessionReplay:return v(this.agentIdentifier)&&!!t;case a.K7.sessionTrace:return!!t;default:return!0}}}var w=i(630);class R extends y{static featureName=w.T;constructor(e,t=!0){super(e,w.T,t),this.importAggregator(e)}}var A=i(908),E=i(843),_=i(878),x=i(782),N=i(863);class k extends y{static featureName=x.T;constructor(e,t=!0){super(e,x.T,t),p.RI&&((0,E.u)((()=>(0,A.p)("docHidden",[(0,N.t)()],void 0,x.T,this.ee)),!0),(0,_.sp)("pagehide",(()=>(0,A.p)("winPagehide",[(0,N.t)()],void 0,x.T,this.ee))),this.importAggregator(e))}}var T=i(773);class j extends y{static featureName=T.TZ;constructor(e,t=!0){super(e,T.TZ,t),this.importAggregator(e)}}new class extends o{constructor(t){super(),p.gm?(this.features={},(0,m.bQ)(this.agentIdentifier,this),this.desiredFeatures=new Set(t.features||[]),this.desiredFeatures.add(R),this.runSoftNavOverSpa=[...this.desiredFeatures].some((e=>e.featureName===a.K7.softNav)),(0,l.j)(this,t,t.loaderType||"agent"),this.run()):(0,e.R)(21)}get config(){return{info:this.info,init:this.init,loader_config:this.loader_config,runtime:this.runtime}}run(){try{const t=u(this.agentIdentifier),r=[...this.desiredFeatures];r.sort(((e,t)=>a.P3[e.featureName]-a.P3[t.featureName])),r.forEach((r=>{if(!t[r.featureName]&&r.featureName!==a.K7.pageViewEvent)return;if(this.runSoftNavOverSpa&&r.featureName===a.K7.spa)return;if(!this.runSoftNavOverSpa&&r.featureName===a.K7.softNav)return;const n=function(e){switch(e){case a.K7.ajax:return[a.K7.jserrors];case a.K7.sessionTrace:return[a.K7.ajax,a.K7.pageViewEvent];case a.K7.sessionReplay:return[a.K7.sessionTrace];case a.K7.pageViewTiming:return[a.K7.pageViewEvent];default:return[]}}(r.featureName).filter((e=>!(e in this.features)));n.length>0&&(0,e.R)(36,{targetFeature:r.featureName,missingDependencies:n}),this.features[r.featureName]=new r(this)}))}catch(t){(0,e.R)(22,t);for(const e in this.features)this.features[e].abortHandler?.();const r=(0,m.Zm)();delete r.initializedAgents[this.agentIdentifier]?.api,delete r.initializedAgents[this.agentIdentifier]?.features,delete this.sharedAggregator;return r.ee.get(this.agentIdentifier).abort(),!1}}}({features:[R,k,j],loaderType:"lite"})})()})();</script>
<noscript><style>form.antibot * :not(.antibot-message) { display: none !important; }</style>
</noscript><script async src="https://www.googletagmanager.com/gtag/js?id=G-HEQ0YF2VYL"></script>
<script>window.dataLayer = window.dataLayer || [];function gtag(){dataLayer.push(arguments)};gtag("js", new Date());gtag("set", "developer_id.dMDhkMT", true);gtag('set', {'cookie_flags': 'SameSite=None;Secure', 'cookie_domain': 'www.nist.gov'});gtag("config", "G-HEQ0YF2VYL", {"groups":"default","page_placeholder":"PLACEHOLDER_page_location","link_attribution":true,"allow_ad_personalization_signals":false});gtag("config", "G-CSLL4ZEK4L", {"groups":"default","page_placeholder":"PLACEHOLDER_page_location","link_attribution":true,"allow_ad_personalization_signals":false});gtag("event", "custom", {"node_title":"Reflectometry Software","node_id":"1201386","organization":"\u003Ca href=\u0022\/nist-organizations\/nist-headquarters\u0022 hreflang=\u0022en\u0022\u003ENIST Headquarters\u003C\/a\u003E, \u003Ca href=\u0022\/nist-organizations\/nist-headquarters\/laboratory-program","content_type":"Basic page"});</script>
<meta name="description" content="Refl1D for fitting and uncertainty analysis of neutron and X-ray reflectivity data For Windows: no-install zipped ex" />
<link rel="canonical" href="https://www.nist.gov/ncnr/data-reduction-analysis/reflectometry-software" />
<link rel="shortlink" href="https://www.nist.gov/node/1201386" />
<meta name="citation_title" content="Reflectometry Software | NIST" />
<meta property="og:site_name" content="NIST" />
<meta property="og:type" content="Article" />
<meta property="og:url" content="https://www.nist.gov/ncnr/data-reduction-analysis/reflectometry-software" />
<meta property="og:title" content="Reflectometry Software" />
<meta property="og:description" content="Refl1D for fitting and uncertainty analysis of neutron and X-ray reflectivity data For Windows: no-install zipped ex" />
<meta property="og:image" content="https://www.nist.gov/themes/custom/nist_www/img/homepage/nist_mark.png" />
<meta property="article:published_time" content="2017-04-14T12:14-04:00" />
<meta property="article:modified_time" content="2022-07-25T12:18-04:00" />
<meta name="dcterms.title" content="Reflectometry Software" />
<meta name="dcterms.description" content="Refl1D for fitting and uncertainty analysis of neutron and X-ray reflectivity data For Windows: no-install zipped ex" />
<meta name="dcterms.date" content="2017-04-14T12:14-04:00" />
<meta name="dcterms.type" content="text" />
<meta name="dcterms.format" content="text/html" />
<meta name="dcterms.identifier" content="https://www.nist.gov/ncnr/data-reduction-analysis/reflectometry-software" />
<meta name="dcterms.source" content="NIST" />
<meta name="dcterms.created" content="2017-04-14T12:14-04:00" />
<meta name="dcterms.modified" content="2022-07-25T12:18-04:00" />
<meta name="twitter:card" content="summary_large_image" />
<meta name="twitter:description" content="Refl1D for fitting and uncertainty analysis of neutron and X-ray reflectivity data For Windows: no-install zipped ex" />
<meta name="twitter:site" content="NIST" />
<meta name="twitter:title" content="Reflectometry Software" />
<meta name="google-site-verification" content="QMu0ODkER3rN5hLcMLqNVf7e3bkjYsNLTuhqfH48jCA" />
<meta name="Generator" content="Drupal 10 (https://www.drupal.org)" />
<meta name="MobileOptimized" content="width" />
<meta name="HandheldFriendly" content="true" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="nist_search_modified" class="elastic" content="2022-07-25T12:18:00-04:00" />
<meta name="nist_search_bundle" class="elastic" content="page" />
<link rel="icon" href="/themes/custom/nist_www/favicon.ico" type="image/vnd.microsoft.icon" />
<title>Reflectometry Software | NIST</title>
<link rel="stylesheet" media="all" href="/sites/default/files/css/css_BcQ1n-m6Yw-MVnttyupUg1rURRVJ_k6elacSDSSo2Vs.css?delta=0&amp;language=en&amp;theme=nist_www&amp;include=eJxFTgEKxCAM-5DMJ0nVspVVK1bPu9-f290QSmnShMRDOF2TOcX6dTsKkk0mba4dmHBywh6qSxJtJAXP6JjyafSjDdP0Kt56u7N44J93jPFgfLdLb2PtBXj7Q1Ogwl6hHPp8FrP1XLpn0gOjUQkE7BJGgiuNgnkRDrX33mavzrhSE4UqSg2_Ki9Yow" />
<link rel="stylesheet" media="all" href="/sites/default/files/css/css_kGS0ApDpFo-_3JI4Ijxg4RCWlTqsImK3lqH7bCv5v2U.css?delta=1&amp;language=en&amp;theme=nist_www&amp;include=eJxFTgEKxCAM-5DMJ0nVspVVK1bPu9-f290QSmnShMRDOF2TOcX6dTsKkk0mba4dmHBywh6qSxJtJAXP6JjyafSjDdP0Kt56u7N44J93jPFgfLdLb2PtBXj7Q1Ogwl6hHPp8FrP1XLpn0gOjUQkE7BJGgiuNgnkRDrX33mavzrhSE4UqSg2_Ki9Yow" />
<link rel="stylesheet" media="print" href="/sites/default/files/css/css_-IXwLuTUdm8IGHxib8GX8wWKw3LjKsNWSYYskZ5fEGg.css?delta=2&amp;language=en&amp;theme=nist_www&amp;include=eJxFTgEKxCAM-5DMJ0nVspVVK1bPu9-f290QSmnShMRDOF2TOcX6dTsKkk0mba4dmHBywh6qSxJtJAXP6JjyafSjDdP0Kt56u7N44J93jPFgfLdLb2PtBXj7Q1Ogwl6hHPp8FrP1XLpn0gOjUQkE7BJGgiuNgnkRDrX33mavzrhSE4UqSg2_Ki9Yow" />
<link rel="stylesheet" media="all" href="/sites/default/files/css/css_jmXeSZNqhh6ayjrVIlS8rDw3mcnQaE5dzE2ZwwPSzNA.css?delta=3&amp;language=en&amp;theme=nist_www&amp;include=eJxFTgEKxCAM-5DMJ0nVspVVK1bPu9-f290QSmnShMRDOF2TOcX6dTsKkk0mba4dmHBywh6qSxJtJAXP6JjyafSjDdP0Kt56u7N44J93jPFgfLdLb2PtBXj7Q1Ogwl6hHPp8FrP1XLpn0gOjUQkE7BJGgiuNgnkRDrX33mavzrhSE4UqSg2_Ki9Yow" />
<script src="/sites/default/files/js/js_GM8kl6wk698qKTTwusj83bCoGHHtOZ1UinjY1sE_Qbk.js?scope=header&amp;delta=0&amp;language=en&amp;theme=nist_www&amp;include=eJxdjW0OwjAIhi805UiErtjhWFlatHp7O53RLOEHPLwfgcYZ3fqsEH47XuuQzJIyUiZ9uowVjmDIUh0v0lm0ltUoopceIjlBos-7irMsa7E7wxFsLW_mEy_ce00DFVwsQpRKoQer5PmtgaQWSE-7BSamyOV7YmvtT8EP34wQy20lPe_nC6DrXYU"></script>
</head>
<body class="node-1201386">
<a href="#main-content" class="visually-hidden focusable" data-elastic-exclude>
Skip to main content
</a>
<div class="dialog-off-canvas-main-canvas" data-off-canvas-main-canvas>
<!-- nist-index-ignore-start -->
<section data-elastic-exclude class="usa-banner" aria-label="Official government website">
<div class="usa-accordion">
<header class="usa-banner__header">
<div class="usa-banner__inner">
<div class="grid-col-auto">
<img class="usa-banner__header-flag" src="/libraries/nist-component-library/dist/img/us_flag_small.png" alt="U.S. flag">
</div>
<div class="grid-col-fill tablet:grid-col-auto">
<p class="usa-banner__header-text">An official website of the United States government</p>
<p class="usa-banner__header-action" aria-hidden="true">Here’s how you know</p>
</div>
<button class="usa-accordion__button usa-banner__button" aria-expanded="false" aria-controls="gov-banner-default">
<span class="usa-banner__button-text">Here’s how you know</span>
</button>
</div>
</header>
<div class="usa-banner__content usa-accordion__content" id="gov-banner-default">
<div class="grid-row grid-gap-lg">
<div class="usa-banner__guidance tablet:grid-col-6">
<img class="usa-banner__icon usa-media-block__img" src="/libraries/nist-component-library/dist/img/icon-dot-gov.svg" role="img" alt="" aria-hidden="true">
<div class="usa-media-block__body">
<p>
<strong>Official websites use .gov</strong>
<br/>
A <strong>.gov</strong> website belongs to an official government organization in the United States.
</p>
</div>
</div>
<div class="usa-banner__guidance tablet:grid-col-6">
<img class="usa-banner__icon usa-media-block__img" src="/libraries/nist-component-library/dist/img/icon-https.svg" role="img" alt="" aria-hidden="true">
<div class="usa-media-block__body">
<p>
<strong>Secure .gov websites use HTTPS</strong>
<br/>
A <strong>lock</strong> ( <span class="icon-lock">
<svg xmlns="http://www.w3.org/2000/svg" width="52" height="64" viewbox="0 0 52 64" class="usa-banner__lock-image" role="img" aria-labelledby="banner-lock-title banner-lock-description" focusable="false">
<title id="banner-lock-title">Lock</title>
<desc id="banner-lock-description">A locked padlock</desc><path fill="#000000" fill-rule="evenodd" d="M26 0c10.493 0 19 8.507 19 19v9h3a4 4 0 0 1 4 4v28a4 4 0 0 1-4 4H4a4 4 0 0 1-4-4V32a4 4 0 0 1 4-4h3v-9C7 8.507 15.507 0 26 0zm0 8c-5.979 0-10.843 4.77-10.996 10.712L15 19v9h22v-9c0-6.075-4.925-11-11-11z"/></svg>
</span>
) or <strong>https://</strong> means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
</p>
</div>
</div>
</div>
</div>
</div>
</section>
<!-- nist-index-ignore-end -->
<div data-elastic-exclude>
<!-- nist-index-ignore-start -->
<div class="nist-print-header" style="display:none;">
<p class="nist-print-header__url">https://www.nist.gov/ncnr/data-reduction-analysis/reflectometry-software</p>
<img class="nist-print-header__logo" width="289" height="38" src="/libraries/nist-component-library/dist/img/logo/nist_logo_sidestack.svg" alt="National Institute of Standards and Technology" />
</div>
<div class="usa-overlay"></div>
<header class="usa-header nist-header--www nist-header--minimal" role="banner">
<div class="usa-navbar">
<div class="usa-logo flex-fill">
<a href="/" title="National Institute of Standards and Technology" aria-label="Home">
<img src="/libraries/nist-component-library/dist/img/logo/logo.svg" alt="National Institute of Standards and Technology" width="300px" height="80px" />
</a>
</div>
<div class="usa-header__right grid-row flex-auto">
<div class="grid-col-fill nist-header__search-group">
<form class="usa-search usa-search--small"
accept-charset="UTF-8"
action="/search"
id="search_form"
method="get">
<div role="search">
<label class="usa-sr-only" for="search-form">Search NIST</label>
<input class="usa-input" id="search-form" type="search" name="s" placeholder="Search NIST" required="" maxlength="128">
<button class="usa-button" type="submit"><img src="/libraries/nist-component-library/dist/img/usa-icons-bg/search--white.svg" class="usa-search__submit-icon" alt="Search"></button>
</div>
</form>
</div>
<div class="grid-col-auto padding-left-1">
<button class="usa-menu-btn">Menu</button>
</div>
</div>
</div>
<nav aria-label="Primary navigation" class="usa-nav">
<div class="usa-nav__inner">
<button class="usa-nav__close">Close</button>
<ul class="usa-nav__primary usa-accordion">
<li class="usa-nav__primary-item">
<a class="usa-nav__link" href="/publications">Publications</a>
</li>
<li class="usa-nav__primary-item">
<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-2"><span>What We Do</span></button>
<div id="primary_menu-2" class="usa-nav__submenu usa-megamenu">
<div class="grid-row">
<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="/topics" class="usa-nav__link">All Topics</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/advanced-communications" class="usa-nav__link">Advanced communications</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/artificial-intelligence" class="usa-nav__link">Artificial intelligence</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/bioscience" class="usa-nav__link">Bioscience</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/buildings-construction" class="usa-nav__link">Buildings and construction</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/chemistry" class="usa-nav__link">Chemistry</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/cybersecurity" class="usa-nav__link">Cybersecurity</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/electronics" class="usa-nav__link">Electronics</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/energy" class="usa-nav__link">Energy</a>
</li>
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="/environment" class="usa-nav__link">Environment</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/fire" class="usa-nav__link">Fire</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/forensic-science" class="usa-nav__link">Forensic science</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/health" class="usa-nav__link">Health</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/information-technology" class="usa-nav__link">Information technology</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/infrastructure" class="usa-nav__link">Infrastructure</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/manufacturing" class="usa-nav__link">Manufacturing</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/materials" class="usa-nav__link">Materials</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/mathematics-statistics" class="usa-nav__link">Mathematics and statistics</a>
</li>
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="/metrology" class="usa-nav__link">Metrology</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/nanotechnology" class="usa-nav__link">Nanotechnology</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/neutron-research" class="usa-nav__link">Neutron research</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/performance-excellence" class="usa-nav__link">Performance excellence</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/physics" class="usa-nav__link">Physics</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/public-safety" class="usa-nav__link">Public safety</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/quantum-information-science" class="usa-nav__link">Quantum information science</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/resilience" class="usa-nav__link">Resilience</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/standards" class="usa-nav__link">Standards</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/transportation" class="usa-nav__link">Transportation</a>
</li>
</ul>
</div>
</div>
</div>
</li>
<li class="usa-nav__primary-item">
<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-3"><span>Labs &amp; Major Programs</span></button>
<div id="primary_menu-3" class="usa-nav__submenu usa-megamenu">
<div class="grid-row">
<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="/adlp" class="usa-nav__link">Assoc Director of Laboratory Programs</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/laboratories" class="usa-nav__link">Laboratories</a>
<ul class="usa-nav__submenu-list">
<li>
<a href="/ctl" class="usa-nav__link">Communications Technology Laboratory</a>
</li>
<li>
<a href="/el" class="usa-nav__link">Engineering Laboratory</a>
</li>
<li>
<a href="/itl" class="usa-nav__link">Information Technology Laboratory</a>
</li>
<li>
<a href="/mml" class="usa-nav__link">Material Measurement Laboratory</a>
</li>
<li>
<a href="/pml" class="usa-nav__link">Physical Measurement Laboratory</a>
</li>
</ul>
</li>
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="/user-facilities" class="usa-nav__link">User Facilities</a>
<ul class="usa-nav__submenu-list">
<li>
<a href="/ncnr" class="usa-nav__link">NIST Center for Neutron Research</a>
</li>
<li>
<a href="/cnst" class="usa-nav__link">CNST NanoFab</a>
</li>
</ul>
</li>
<li class="usa-nav__submenu-item">
<a href="/labs-major-programs/research-test-beds" class="usa-nav__link">Research Test Beds</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/laboratories/projects-programs" class="usa-nav__link">Research Projects</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/laboratories/tools-instruments" class="usa-nav__link">Tools &amp; Instruments</a>
</li>
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="/major-programs" class="usa-nav__link">Major Programs</a>
<ul class="usa-nav__submenu-list">
<li>
<a href="/baldrige" class="usa-nav__link">Baldrige Performance Excellence Program</a>
</li>
<li>
<a href="/chips" class="usa-nav__link">CHIPS for America Initiative</a>
</li>
<li>
<a href="/mep" class="usa-nav__link">Manufacturing Extension Partnership (MEP)</a>
</li>
<li>
<a href="/oam" class="usa-nav__link">Office of Advanced Manufacturing</a>
</li>
<li>
<a href="/spo" class="usa-nav__link">Special Programs Office</a>
</li>
<li>
<a href="/tpo" class="usa-nav__link">Technology Partnerships Office</a>
</li>
</ul>
</li>
</ul>
</div>
</div>
</div>
</li>
<li class="usa-nav__primary-item">
<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-4"><span>Services &amp; Resources</span></button>
<div id="primary_menu-4" class="usa-nav__submenu usa-megamenu">
<div class="grid-row">
<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="/content/standards-measurements" class="usa-nav__link">Standards and Measurements</a>
<ul class="usa-nav__submenu-list">
<li>
<a href="/calibrations" class="usa-nav__link">Calibration Services</a>
</li>
<li>
<a href="/nvlap" class="usa-nav__link">Laboratory Accreditation (NVLAP)</a>
</li>
<li>
<a href="/nist-quality-system" class="usa-nav__link">Quality System</a>
</li>
<li>
<a href="/srm" class="usa-nav__link">Standard Reference Materials (SRMs)</a>
</li>
<li>
<a href="/sri" class="usa-nav__link">Standard Reference Instruments (SRIs)</a>
</li>
<li>
<a href="/standardsgov" class="usa-nav__link">Standards.gov</a>
</li>
<li>
<a href="/pml/time-and-frequency-division/time-services" class="usa-nav__link">Time Services</a>
</li>
<li>
<a href="/pml/owm" class="usa-nav__link">Office of Weights and Measures</a>
</li>
</ul>
</li>
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="/services-resources/software" class="usa-nav__link">Software</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/data" class="usa-nav__link">Data</a>
<ul class="usa-nav__submenu-list">
<li>
<a href="https://webbook.nist.gov/chemistry/" class="usa-nav__link">Chemistry WebBook</a>
</li>
<li>
<a href="https://nvd.nist.gov/" class="usa-nav__link">National Vulnerability Database</a>
</li>
<li>
<a href="/pml/productsservices/physical-reference-data" class="usa-nav__link">Physical Reference Data</a>
</li>
<li>
<a href="/srd" class="usa-nav__link">Standard Reference Data (SRD)</a>
</li>
</ul>
</li>
<li class="usa-nav__submenu-item">
<a href="https://shop.nist.gov/" class="usa-nav__link">Storefront</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/tpo" class="usa-nav__link">License &amp; Patents</a>
</li>
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="https://csrc.nist.gov/" class="usa-nav__link">Computer Security Resource Center (CSRC)</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/nist-research-library" class="usa-nav__link">NIST Research Library</a>
</li>
</ul>
</div>
</div>
</div>
</li>
<li class="usa-nav__primary-item">
<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-5"><span>News &amp; Events</span></button>
<div id="primary_menu-5" class="usa-nav__submenu usa-megamenu">
<div class="grid-row">
<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="/news-events/news" class="usa-nav__link">News</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/news-events/events" class="usa-nav__link">Events</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/blogs" class="usa-nav__link">Blogs</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/feature-stories" class="usa-nav__link">Feature Stories</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/awards" class="usa-nav__link">Awards</a>
</li>
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="/video-gallery" class="usa-nav__link">Video Gallery</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/image-gallery" class="usa-nav__link">Image Gallery</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/pao/media-contacts" class="usa-nav__link">Media Contacts</a>
</li>
</ul>
</div>
</div>
</div>
</li>
<li class="usa-nav__primary-item">
<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-6"><span>About NIST</span></button>
<div id="primary_menu-6" class="usa-nav__submenu usa-megamenu">
<div class="grid-row">
<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="/about-nist" class="usa-nav__link">About Us</a>
<ul class="usa-nav__submenu-list">
<li>
<a href="/director/leadership" class="usa-nav__link">Leadership</a>
</li>
<li>
<a href="/director/nist-organization-structure" class="usa-nav__link">Organization Structure</a>
</li>
<li>
<a href="/about-nist/budget-planning" class="usa-nav__link">Budget &amp; Planning</a>
</li>
</ul>
</li>
<li class="usa-nav__submenu-item">
<a href="/about-nist/contact-us" class="usa-nav__link">Contact Us</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/about-nist/visit" class="usa-nav__link">Visit</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/careers" class="usa-nav__link">Careers</a>
<ul class="usa-nav__submenu-list">
<li>
<a href="/iaao/academic-affairs-office" class="usa-nav__link">Student programs</a>
</li>
</ul>
</li>
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
<li class="usa-nav__submenu-item">
<a href="/about-nist/work-nist" class="usa-nav__link">Work with NIST</a>
</li>
<li class="usa-nav__submenu-item">
<a href="/history" class="usa-nav__link">History</a>
<ul class="usa-nav__submenu-list">
<li>
<a href="http://nistdigitalarchives.contentdm.oclc.org/" class="usa-nav__link">NIST Digital Archives</a>
</li>
<li>
<a href="/nist-museum" class="usa-nav__link">NIST Museum</a>
</li>
<li>
<a href="/nist-and-nobel" class="usa-nav__link">NIST and the Nobel</a>
</li>
</ul>
</li>
<li class="usa-nav__submenu-item">
<a href="/education" class="usa-nav__link">Educational Resources</a>
</li>
</ul>
</div>
</div>
</div>
</li>
</ul>
</div>
</nav>
</header>
<!-- nist-index-ignore-end -->
</div>
<div class="grid-container">
</div>
<div
id="block-nist-www-content" class="nist-block"
>
<section
class="nist-page__content usa-section clearfix"
>
<a id="main-content" tabindex="-1"></a>
<div
class="nist-page__region nist-page__region--content-top-full"
>
<div
class="nist-block"
>
<div class="nist-section-header nist-section-header--341086 nist-section-header--menu nist-section-header--interior">
<div class="nist-section-header__main grid-container">
<div class="nist-section-header__title">
<h2><a href="/ncnr">NIST Center for Neutron Research</a></h2>
</div>
</div>
</div>
</div>
</div>
<div class="grid-container margin-top-4">
<div class="grid-row grid-gap-6">
<aside class="nist-page__region nist-page__region--sidebar-first tablet-lg:grid-col-4 desktop-lg:grid-col-3">
<div>
<!-- nist-index-ignore-start -->
<div
class="views-element-container nist-block nist-block--section-nav" data-elastic-exclude=""
>
<div><div class="js-view-dom-id-8a749286598ef4011090d501e7501687f9260e25d128d3676924af3b6c95c064">
<div><div class="views-field views-field-nid"><span class="field-content">
<nav>
<ul class="usa-sidenav usa-accordion ">
<li class="usa-sidenav__item">
<a href="https://www-s.nist.gov/NCNR-IMS/login.do" data-drupal-link-system-path="">Logon to your NCNR-IMS account</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/obtaining-beam-time" data-drupal-link-system-path="">Obtaining Beam Time</a>
</li>
<li class="usa-sidenav__item usa-sidenav__item--parent">
<a href="/ncnr/arrange-visit-ncnr" data-drupal-link-system-path="">Arrange a visit to NCNR</a>
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nist-center-for-neutron-res-3"><span class="usa-sr-only">Expand or Collapse</span></button>
<ul id="menu-nist-center-for-neutron-res-3" class="usa-sidenav__sublist usa-accordion">
<li class="usa-sidenav__item">
<a href="/ncnr/chrns/travel-support" data-drupal-link-system-path="">CHRNS Student Travel Assistance</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/arrange-visit-ncnr/financial-assistance" data-drupal-link-system-path="">U. Maryland Travel Assistance</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/arrange-visit-ncnr/hotels-and-travel" data-drupal-link-system-path="">Hotels and Travel</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/arrange-visit-ncnr/obtaining-access-ncnr" data-drupal-link-system-path="">Obtaining Access to NCNR</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/arrange-visit-ncnr/visa-questions" data-drupal-link-system-path="">Visa Questions?</a>
</li>
<li class="usa-sidenav__item">
<a href="/about-nist/visit/campus-access-and-security" data-drupal-link-system-path="">NIST Access Control Policy</a>
</li>
</ul>
</li>
<li class="usa-sidenav__item usa-sidenav__item--parent">
<a href="/ncnr/planning-your-experiment" data-drupal-link-system-path="">Planning Your Experiment</a>
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nist-center-for-neutron-res-4"><span class="usa-sr-only">Expand or Collapse</span></button>
<ul id="menu-nist-center-for-neutron-res-4" class="usa-sidenav__sublist usa-accordion">
<li class="usa-sidenav__item">
<a href="/ncnr/planning-your-experiment/shipping-samples-ncnr" data-drupal-link-system-path="">Shipping samples to NCNR</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/planning-your-experiment/scattering-length-periodic-table" data-drupal-link-system-path="">Scattering Length Periodic Table</a>
</li>
<li class="usa-sidenav__item">
<a href="http://www.ncnr.nist.gov/resources/activation/" data-drupal-link-system-path="">Activation and SLD Calculator</a>
</li>
</ul>
</li>
<li class="usa-sidenav__item">
<a href="https://www.ncnr.nist.gov/ipeek" data-drupal-link-system-path="">Live Data</a>
</li>
<li class="usa-sidenav__item usa-sidenav__item--parent">
<a href="/ncnr/about-ncnr" data-drupal-link-system-path="">About NCNR</a>
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nist-center-for-neutron-res-6"><span class="usa-sr-only">Expand or Collapse</span></button>
<ul id="menu-nist-center-for-neutron-res-6" class="usa-sidenav__sublist usa-accordion">
<li class="usa-sidenav__item">
<a href="https://www.nist.gov/publications/nist-center-neutron-research-over-40-years-serving-nistnbs-and-nation" data-drupal-link-system-path="">Informal History</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/about-ncnr/employmentresearch-opportunities" data-drupal-link-system-path="">Employment/Research Opportunities</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/about-ncnr/ncnr-annual-reports" data-drupal-link-system-path="">NCNR Annual Reports</a>
</li>
<li class="usa-sidenav__item">
<a href="https://www.nist.gov/system/files/documents/2019/09/24/ncnr_dmp_v04.pdf" data-drupal-link-system-path="">Data Management Plan</a>
</li>
</ul>
</li>
<li class="usa-sidenav__item usa-sidenav__item--parent">
<a href="/ncnr/neutron-instruments" data-drupal-link-system-path="">Neutron Instruments</a>
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nist-center-for-neutron-res-7"><span class="usa-sr-only">Expand or Collapse</span></button>
<ul id="menu-nist-center-for-neutron-res-7" class="usa-sidenav__sublist usa-accordion">
<li class="usa-sidenav__item">
<a href="/ncnr/neutron-instruments/general-info-and-layout" data-drupal-link-system-path="">General Info and Layout</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/neutron-instruments/instrument-contacts" data-drupal-link-system-path="">Instrument contacts</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/neutron-instruments/instrument-control-software-0" title="Info on the NICE instrument control environment" data-drupal-link-system-path="">Instrument Control Software</a>
</li>
<li class="usa-sidenav__item">
<a href="http://physics.nist.gov/MajResFac/NIF/" data-drupal-link-system-path="">Neutron imaging</a>
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nist-center-for-neutron-res-7-4"><span class="usa-sr-only">Expand or Collapse</span></button>
<ul id="menu-nist-center-for-neutron-res-7-4" class="usa-sidenav__sublist usa-accordion">
<li class="usa-sidenav__item">
<a href="https://www.nist.gov/laboratories/tools-instruments/neutron-imaging-facility-nif" data-drupal-link-system-path="">BT2 Neutron Imaging Facility (NIF)</a>
</li>
<li class="usa-sidenav__item">
<a href="/laboratories/tools-instruments/cold-neutron-imaging-instrument" data-drupal-link-system-path="">NG6 Cold Neutron Imaging Facility</a>
</li>
</ul>
</li>
<li class="usa-sidenav__item">
<a href="https://www.ncnr.nist.gov/instruments/bt1/" data-drupal-link-system-path="">Crystallography</a>
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nist-center-for-neutron-res-7-5"><span class="usa-sr-only">Expand or Collapse</span></button>
<ul id="menu-nist-center-for-neutron-res-7-5" class="usa-sidenav__sublist usa-accordion">
<li class="usa-sidenav__item">
<a href="/ncnr/high-resolution-powder-diffractometer-bt-1" data-drupal-link-system-path="">BT1 High Resolution Powder Diffractometer</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/bt-8-diffractometer-stress-and-texture" data-drupal-link-system-path="">BT8 Residual Stress Diffractometer</a>
</li>
</ul>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/neutron-instruments/reflectometry" data-drupal-link-system-path="">Reflectometry</a>
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nist-center-for-neutron-res-7-6"><span class="usa-sr-only">Expand or Collapse</span></button>
<ul id="menu-nist-center-for-neutron-res-7-6" class="usa-sidenav__sublist usa-accordion">
<li class="usa-sidenav__item">
<a href="https://www.nist.gov/ncnr/chrns-candor-white-beam-reflectometer" data-drupal-link-system-path="">CANDOR White Beam Reflectometer [CHRNS]</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/magik-reflectometer" data-drupal-link-system-path="">MAGIK Offspecular Reflectometer</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/ng7-horizontal-neutron-reflectometer" data-drupal-link-system-path="">NG7 Cold Neutron Reflectometer- Horizontal Sample Geometry</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/polarized-beam-reflectometer-pbr" data-drupal-link-system-path="">Polarized Beam Reflectometer/Diffractometer (PBR)</a>
</li>
</ul>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/neutron-instruments/small-angle-neutron-scattering-sans" data-drupal-link-system-path="">Small Angle Neutron Scattering (SANS)</a>
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nist-center-for-neutron-res-7-7"><span class="usa-sr-only">Expand or Collapse</span></button>
<ul id="menu-nist-center-for-neutron-res-7-7" class="usa-sidenav__sublist usa-accordion">
<li class="usa-sidenav__item">
<a href="https://www.nist.gov/ncnr/chrns-usans-ultra-small-angle-neutron-scattering" data-drupal-link-system-path="">BT5 Perfect Crystal SANS (USANS)</a>
</li>
<li class="usa-sidenav__item">
<a href="https://www.nist.gov/ncnr/chrns-vsans-very-small-angle-neutron-scattering" data-drupal-link-system-path="">NG3 Very Small Angle Scattering Instrument [CHRNS]</a>
</li>
<li class="usa-sidenav__item">
<a href="https://www.nist.gov/ncnr/ng7-sans-small-angle-neutron-scattering" data-drupal-link-system-path="">NG7 30m Small Angle Scattering Instrument</a>
</li>
<li class="usa-sidenav__item">
<a href="http://www.nist.gov/ncnr/10m-sans-small-angle-neutron-scattering" data-drupal-link-system-path="">NGB 10 m Small Angle Scattering Instrument [nSOFT]</a>
</li>
<li class="usa-sidenav__item">
<a href="https://www.nist.gov/ncnr/chrns-30m-sans-small-angle-neutron-scattering" data-drupal-link-system-path="">NGB 30m Small Angle Scattering Instrument</a>
</li>
</ul>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/neutron-instruments/spectroscopy" data-drupal-link-system-path="">Spectroscopy</a>
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nist-center-for-neutron-res-7-8"><span class="usa-sr-only">Expand or Collapse</span></button>
<ul id="menu-nist-center-for-neutron-res-7-8" class="usa-sidenav__sublist usa-accordion">
<li class="usa-sidenav__item">
<a href="/ncnr/filter-analyzer-spectrometer-fans" data-drupal-link-system-path="">BT4 Filter Analyzer Neutron Spectrometer</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/bt-4-triple-axis-spectrometer" data-drupal-link-system-path="">BT4 Triple Axis Spectrometer</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/bt-7-double-focusing-triple-axis-spectrometer" data-drupal-link-system-path="">BT7 Triple Axis Spectrometer</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/chrns-macs-multi-axis-crystal-spectrometer" data-drupal-link-system-path="">BT9 Multi-Axis Crystal Spectrometer (MACS) [CHRNS]</a>
</li>
<li class="usa-sidenav__item">
<a href="https://www.nist.gov/ncnr/high-flux-backscattering-spectrometer" data-drupal-link-system-path="">NG2 High-Flux Backscattering Spectrometer (HFBS) [CHRNS]</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/dcs-disk-chopper-spectrometer" data-drupal-link-system-path="">NG4 Disk-Chopper Time-of-Flight Spectrometer (DCS)</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/spin-polarized-inelastic-neutron-spectrometer-spins" data-drupal-link-system-path="">NG5 Spin-Polarized Triple-axis Spectrometer (SPINS)</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/chrns-nse-neutron-spin-echo-spectrometer" data-drupal-link-system-path="">NGA Neutron Spin Echo Spectrometer (NSE) [CHRNS]</a>
</li>
</ul>
</li>
<li class="usa-sidenav__item">
<a href="/pml/radiation-physics/neutron-physics" data-drupal-link-system-path="">Neutron physics</a>
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nist-center-for-neutron-res-7-9"><span class="usa-sr-only">Expand or Collapse</span></button>
<ul id="menu-nist-center-for-neutron-res-7-9" class="usa-sidenav__sublist usa-accordion">
<li class="usa-sidenav__item">
<a href="http://www.nist.gov/pml/div682/grp03/index.cfm" data-drupal-link-system-path="">NG6M Neutron Physics</a>
</li>
<li class="usa-sidenav__item">
<a href="/laboratories/tools-instruments/neutron-interferometry-and-optics-facilities" data-drupal-link-system-path="">NG7 Neutron Interferometer (NIOF)</a>
</li>
<li class="usa-sidenav__item">
<a href="http://www.nist.gov/pml/div682/grp03/index.cfm" data-drupal-link-system-path="">NGC Neutron Physics 0.5 nm</a>
</li>
</ul>
</li>
</ul>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/schedules" data-drupal-link-system-path="">Schedules</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/spin-filters" data-drupal-link-system-path="">Spin Filters</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/sample-environment" data-drupal-link-system-path="">Sample Environment</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/sample-prep-labs" data-drupal-link-system-path="">Sample Prep Labs</a>
</li>
<li class="usa-sidenav__item usa-sidenav__item--parent">
<a href="/ncnr/data-reduction-analysis" class="usa-current" data-drupal-link-system-path="">Data Reduction &amp; Analysis</a>
<button class="usa-accordion__button" aria-expanded="true" aria-controls="menu-nist-center-for-neutron-res-12"><span class="usa-sr-only">Expand or Collapse</span></button>
<ul id="menu-nist-center-for-neutron-res-12" class="usa-sidenav__sublist usa-accordion">
<li class="usa-sidenav__item">
<a href="/ncnr/data-reduction-analysis/reflectometry-software" class="usa-current" data-drupal-link-system-path="">Reflectometry Software</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/data-reduction-analysis/sans-software" data-drupal-link-system-path="">SANS Software</a>
</li>
</ul>
</li>
<li class="usa-sidenav__item usa-sidenav__item--parent">
<a href="/ncnr/publishing-your-results" data-drupal-link-system-path="">Publishing Your Results</a>
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nist-center-for-neutron-res-13"><span class="usa-sr-only">Expand or Collapse</span></button>
<ul id="menu-nist-center-for-neutron-res-13" class="usa-sidenav__sublist usa-accordion">
<li class="usa-sidenav__item">
<a href="/ncnr/chrns/publications-and-acknowledgment" data-drupal-link-system-path="">Publishing CHRNS Results</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/publishing-your-results/werb" data-drupal-link-system-path="">WERB</a>
</li>
</ul>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/facilities-upgrades-during-unplanned-outage" data-drupal-link-system-path="">Facilities Upgrades during the Unplanned Outage</a>
</li>
<li class="usa-sidenav__item">
<a href="/programs-projects/chrns-non-equilibrium-structure-materials-initiative" title="CHRNS Non-Equilibrium Structure of Materials Initiative" data-drupal-link-system-path="">CHRNS Non-Equilibrium Initiative</a>
</li>
<li class="usa-sidenav__item">
<a href="/ncnr/chrns/education-and-outreach" data-drupal-link-system-path="">CHRNS Education and Outreach</a>
</li>
<li class="usa-sidenav__item">
<a href="https://nug.umd.edu/index.html" data-drupal-link-system-path="">NCNR User Group</a>
</li>
</ul>
</nav>
</span></div></div>
</div>
</div>
</div>
<!-- nist-index-ignore-end -->
<!-- nist-index-ignore-start -->
<!-- nist-index-ignore-end -->
</div>
</aside>
<div
class="nist-page__region nist-page__region--content tablet-lg:grid-col-8 desktop-lg:grid-col-9"
>
<div
class="nist-block"
>
<h1 class="nist-page__title">Reflectometry Software</h1>
</div>
<div
class="nist-block"
>
<!-- nist-index-ignore-start -->
<div data-elastic-exclude class="nist-block nist-social__wrapper">
<h2 class="nist-social__title">Share</h2>
<div class="social-media-sharing">
<div class="nist-social__wrapper--share">
<div>
<a target="_blank" rel="noopener" href="https://www.facebook.com/share.php?u=https://www.nist.gov/ncnr/data-reduction-analysis/reflectometry-software"
title="Facebook" class="nist-social nist-social--facebook-gray">
<span>Facebook</span>
</a>
</div>
<div>
<a target="_blank" rel="noopener" href="https://www.linkedin.com/shareArticle?mini=true&amp;url=https://www.nist.gov/ncnr/data-reduction-analysis/reflectometry-software&amp;source=https://www.nist.gov/ncnr/data-reduction-analysis/reflectometry-software"
title="Linkedin" class="nist-social nist-social--linkedin-gray">
<span>Linkedin</span>
</a>
</div>
<div>
<a target="_blank" rel="noopener" href="https://x.com/intent/tweet?url=https://www.nist.gov/ncnr/data-reduction-analysis/reflectometry-software&amp;status=https://www.nist.gov/ncnr/data-reduction-analysis/reflectometry-software"
title="X.com" class="nist-social nist-social--x-gray">
<span>X.com</span>
</a>
</div>
<div>
<a href="mailto:?subject=NIST.gov&amp;body=Check out this site https://www.nist.gov/ncnr/data-reduction-analysis/reflectometry-software"
title="Email" class="nist-social nist-social--envelope-gray">
<span>Email</span>
</a>
</div>
</div>
</div>
</div>
<!-- nist-index-ignore-end -->
</div>
<div
class="nist-block"
>
<div class="text-with-summary">
<h2>Refl1D</h2>
<h3>for fitting and uncertainty analysis of neutron and X-ray reflectivity data</h3>
<h4>For Windows: no-install zipped executable</h4>
<ul>
<li>Download the “...exe.zip” file from the most recent release at <a href="https://github.com/reflectometry/refl1d/releases"><span>https://github.com/reflectometry/refl1d/releases</span></a></li>
<li>Extract it to a folder on your computer</li>
<li>Run (double-click) “refl1d_gui.bat” from that folder.&nbsp;</li>
</ul>
<p>To upgrade to a newer version, delete the entire folder and download the new zip file and repeat the steps above.</p>
<h4>Installation from the Python Package Index (pip install)</h4>
<ul>
<li>Install&nbsp;Python 3 (version 3.5 or greater, such as from&nbsp; <a href="https://www.python.org/downloads/">Python.org</a>&nbsp;or <a href="https://conda.io/miniconda.html">Anaconda</a>)</li>
<li>open a terminal window (plain terminal on mac, Anaconda Prompt on Windows) and issue these commands:
<ul>
<li>pip&nbsp;install numpy scipy matplotlib wxpython periodictable</li>
<li>pip install refl1d</li>
</ul>
</li>
</ul>
<p>Then issuing the command "refl1d" from the command line will start the command-line client, and "refl1d --edit" will start an interactive fitting session.&nbsp; "pip install --upgrade refl1d" will update to the latest version, any time.</p>
<p><strong><em>Mac OS X notes (for pip install)</em></strong></p>
<ul>
<li>If you install Python 3 from <a href="https://www.python.org/downloads/">Python.org</a> you can simply replace "pip" with "pip3" in the install instructions above, and it will just work.
<ul>
<li>for (optional) virtual environment: <a href="https://docs.python.org/3/library/venv.html">use the builtin venv package</a> so that the gui command "refl1d --edit" will still work</li>
<li>(virtualenv and virtualenvwrapper use a copy of the binary instead of linking to the Framework binary, so they may not work)</li>
</ul>
</li>
<li>If you use an Anaconda Python distribution, to start an interactive refl1d session you will have to type this command in the terminal:
<ul>
<li><strong>pythonw -m refl1d.main --edit</strong>
<ul>
<li>If pythonw is not installed, you may need to run "conda install python.app" in your environment.</li>
</ul>
</li>
</ul>
</li>
</ul>
<p><strong><em>Windows notes (for pip install)</em></strong></p>
<ul>
<li>If you install Python3.10 there may not be a pre-built version of wx from pip&nbsp;yet (as of mid-2022).&nbsp; If you don't want to install a compiler suite (see below), use python 3.9 or python 3.8 instead.</li>
<li>you might need to install a compatible C++ compiler&nbsp;(but you probably don't)
<ul>
<li><a href="https://www.visualstudio.com/thank-you-downloading-visual-studio/?sku=BuildTools&amp;rel=15">Build Tools for Visual Studio</a> (install C++ compiler from list)</li>
</ul>
</li>
</ul>
<h4>Additional information</h4>
<p>See the <a href="http://refl1d.readthedocs.org/">Refl1D manual</a> for details of the program. Refl1D uses&nbsp;<a href="http://bumps.readthedocs.org/">Bumps</a>&nbsp;for fitting and&nbsp;<a href="http://periodictable.readthedocs.org/">PeriodicTable</a>&nbsp;for scattering length density calculations.</p>
<p>Citing this software: acknowledging Refl1D in publications may be done by making a reference to this site. For example:</p>
<p>The Refl1D program was used for elements of the data analysis[1].<br>
[1] P.A. Kienzle, B.B. Maranville, K.V. O'Donovan, J.F. Ankner, N.F. Berk, C.F. Majkrzak; <a href="https://www.nist.gov/ncnr/reflectometry-software">https://www.nist.gov/ncnr/reflectometry-software</a> 2017-</p>
<h2>Reductus</h2>
<h3>for reduction of raw instrument data to reflectivity data</h3>
<p><span><a href="https://reductus.nist.gov">Reductus</a>&nbsp;is a web application&nbsp;providing&nbsp;support for data reduction of NCNR data.&nbsp; Driven by the&nbsp;</span><a href="https://github.com/reflectometry/reduction">reflred</a>&nbsp;python libraries<span>, reductus supports the common operations required to convert raw X-Ray and neutron reflectivity data to a reflectivity curve in physical units (R vs. Q), performing necessary corrections (background subtractions, scaling etc.)</span></p>
<p>Data files are accessed directly by URL from the <a href="https://dx.doi.org/10.18434/T4201B">NCNR online data repository</a>&nbsp;and the reduction templates (recipes) can be modified with a graphical editor, and downloaded and reused or shared by email. &nbsp;Reduced data can be downloaded in columnar text-file form. &nbsp;No login or password is required to use <a href="https://reductus.nist.gov">the application</a>.</p>
<p>Reductus replaces the <a href="https://www.nist.gov/services-resources/software/reflpak">Reflpak application</a>.&nbsp;<br>
If you use reductus to reduce your experimental data, please consider including a citation to&nbsp;<a href="https://doi.org/10.1107/S1600576718011974">Journal of Applied Crystallography, Volume 51, Part 5, pages 1500-1506</a></p>
<h2><span>PeriodicTable</span></h2>
<p><strong><a href="https://www.ncnr.nist.gov/resources/activation/">Online SLD Calculator:</a> </strong>The online SLD/activation calculator uses the same PeriodicTable package as Refl1D and SasView to compute scattering length density and neutron activation.</p>
<h2>Web Reflectivity Calculators</h2>
<p>For quick data exploration we provide a browser-based &nbsp;<a href="https://ncnr.nist.gov/instruments/magik/calculators/magnetic-reflectivity-calculator.html">magnetic reflectivity calculator</a> as well a non-magnetic <a href="https://ncnr.nist.gov/instruments/magik/calculators/reflectivity-calculator.html">(unpolarized) reflectivity calculator</a>. &nbsp;The user-generated&nbsp;SLD profiles can be exported to a heavily-commented Python Refl1D model file to provide an easy way to get started with modeling data in Refl1D. &nbsp;Please see the <a href="https://www.nist.gov/publications/interactive-web-based-calculator-neutron-and-x-ray-reflectivity">article in J. Res. NIST</a> for more details.</p>
<h2><a href name="disclaimer">Disclaimer</a></h2>
<p>&nbsp;</p>
<p>This software was developed at the National Institute of Standards and Technology at the NIST Center for Neutron Research by employees of the Federal Government in the course of their official duties. Pursuant to title 17 section 105* of the United States Code this software is not subject to copyright protection and is in the public domain. NIST does not assume any responsibility whatsoever for the use of this software, and makes no guarantees, expressed or implied, about its quality, reliability, or any other characteristic. The use of certain trade names or commercial products does not imply any endorsement of a particular product, nor does it imply that the named product is necessarily the best product for the stated purpose. We would appreciate acknowledgment if the software is used.</p>
<p>&nbsp;</p>
<p>*Subject matter of copyright: United States Government works</p>
<p>&nbsp;</p>
<p>Copyright protection under this title is not available for any work of the United States Government, but the United States Government is not precluded from receiving and holding copyrights transferred to it by assignment, bequest, or otherwise.</p>
<p>&nbsp;</p>
<h2>Acknowledgments</h2>
<p>&nbsp;</p>
<p>Portions of this work are based upon activities supported by the National Science Foundation under Agreement No. DMR-0412074.</p>
<p>&nbsp;</p>
<h2>References</h2>
<p>&nbsp;</p>
<dt>Calculating polarized neutron reflectometry</dt>
<dd>C.F. Majrkzak, K.V. O'Donovan, N.F. Berk (2006); Polarized neutron reflectometry. In&nbsp;<em>Neutron Scattering from Magnetic Materials,</em>&nbsp;T. Chatterji, editor. Elsevier.</dd>
<dt>Polarization corrections</dt>
<dd>C.F. Majkrzak (1996); Neutron scattering studies of magnetic thin films and multilayers,&nbsp;<em>Physica B</em>&nbsp;221, 342-356.</dd>
<dt>Modelling interfaces with slabs</dt>
<dd>J.F. Ankner, C.F. Majkrzak (1992); Subsurface profile refinement for neutron specular reflectivity. In&nbsp;<em>S.P.I.E. Conference Proceedings</em>, Vol. 1738. C.F. Majkrzak and J.L. Wood, editors. S.P.I.E., Bellingham, WA.</dd>
</div>
</div>
<div
class="nist-block"
>
<!-- nist-index-ignore-start -->
<div data-elastic-exclude="" class="nist-tags">
<a href="/topic-terms/neutron-research" hreflang="en">Neutron research</a></div>
<!-- nist-index-ignore-end -->
</div>
</div>
</div>
</div>
<div class="grid-container">
<div
class="nist-page__region nist-page__region--content-bottom"
>
<div
class="nist-block nist-block--contact"
>
<h2
class="nist-block__title"
>Contacts</h2>
<div class="nist-contact">
<ul class="nist-contact__items">
<li about="/people/paul-kienzle" class="nist-contact__item">
<div class="nist-contact__name"><a href="/people/paul-kienzle" title="View staff profile page">Paul Kienzle</a></div>
<div>
<a href="mailto:paul.kienzle@nist.gov">paul.kienzle@nist.gov</a>
</div>
<div>
(301) 975-4727
</div>
</li>
<li about="/people/brian-b-maranville" class="nist-contact__item">
<div class="nist-contact__name"><a href="/people/brian-b-maranville" title="View staff profile page">Brian B. Maranville</a></div>
<div>
<a href="mailto:brian.maranville@nist.gov">brian.maranville@nist.gov</a>
</div>
<div>
(301) 975-6034
</div>
</li>
<li about="/people/brian-kirby" class="nist-contact__item">
<div class="nist-contact__name"><a href="/people/brian-kirby" title="View staff profile page">Brian Kirby</a></div>
<div>
<a href="mailto:brian.kirby@nist.gov">brian.kirby@nist.gov</a>
</div>
<div>
(301) 975-8395
</div>
</li>
</ul>
</div>
</div>
<div
class="nist-block"
>
<div class="text-italic font-sans-2xs">
Created April 14, 2017, Updated July 25, 2022
</div>
</div>
</div>
</div>
</section>
</div>
<div data-elastic-exclude>
<!-- nist-index-ignore-start -->
<footer class="nist-footer padding-bottom-4">
<div class="grid-container nist-footer__info">
<div class="grid-row">
<div class="tablet:grid-col-6">
<div class="nist-footer__logo">
<a href="/" title="National Institute of Standards and Technology" rel="home">
<img class="nist-footer__logo-img" src="/libraries/nist-component-library/dist/img/logo/NIST-Logo-Brand-White.svg" alt="National Institute of Standards and Technology logo" width="300px" height="42px" />
</a>
</div>
<div class="nist-footer__contact">
<h3 class="nist-footer__contact-heading">HEADQUARTERS</h3>
<address>
100 Bureau Drive<br>
Gaithersburg, MD 20899<br>
<a href="tel:301-975-2000">301-975-2000</a>
</address>
<p>
<a href="mailto:do-webmaster@nist.gov">Webmaster</a> | <a href="https://www.nist.gov/about-nist/contact-us">Contact Us</a> | <a href="https://www.nist.gov/visit">Our Other Offices</a>
</p>
</div>
</div>
<div class="tablet:grid-col-6">
<div class="nist-footer__social-links">
<a class="nist-social nist-social--x-white" href=" https://x.com/NIST">
<span>X.com</span>
</a>
<a class="nist-social nist-social--facebook-white" href=" https://www.facebook.com/NIST">
<span>Facebook</span>
</a>
<a class="nist-social nist-social--linkedin-white" href=" https://www.linkedin.com/company/nist">
<span>LinkedIn</span>
</a>
<a class="nist-social nist-social--instagram-white" href=" https://www.instagram.com/nist/">
<span>Instagram</span>
</a>
<a class="nist-social nist-social--youtube-white" href=" https://www.youtube.com/NIST">
<span>YouTube</span>
</a>
<a class="nist-social nist-social--giphy-white" href=" https://giphy.com/nist">
<span>Giphy</span>
</a>
<a class="nist-social nist-social--rss-white" href=" https://www.nist.gov/news-events/nist-rss-feeds">
<span>RSS Feed</span>
</a>
<a class="nist-social nist-social--envelope-white" href=" https://public.govdelivery.com/accounts/USNIST/subscriber/new">
<span>Mailing List</span>
</a>
</div>
<div class="nist-footer__feedback">
How are we doing? <a class="usa-button" rel="nofollow" href="/form/nist-gov-feedback?destination=/ncnr/data-reduction-analysis/reflectometry-software" title="Provide feedback">Feedback</a>
</div>
</div>
</div>
</div>
<div class="grid-container">
<div class="nist-footer__nav" role="navigation">
<ul>
<li class="nist-footer__menu-item">
<a href="https://www.nist.gov/privacy-policy">Site Privacy</a>
</li>
<li class="nist-footer__menu-item">
<a href="https://www.nist.gov/oism/accessibility">Accessibility</a>
</li>
<li class="nist-footer__menu-item">
<a href="https://www.nist.gov/privacy">Privacy Program</a>
</li>
<li class="nist-footer__menu-item">
<a href="https://www.nist.gov/oism/copyrights">Copyrights</a>
</li>
<li class="nist-footer__menu-item">
<a href="https://www.commerce.gov/vulnerability-disclosure-policy">Vulnerability Disclosure</a>
</li>
<li class="nist-footer__menu-item">
<a href="https://www.nist.gov/no-fear-act-policy">No Fear Act Policy</a>
</li>
<li class="nist-footer__menu-item">
<a href="https://www.nist.gov/office-director/freedom-information-act">FOIA</a>
</li>
<li class="nist-footer__menu-item">
<a href="https://www.nist.gov/environmental-policy-statement">Environmental Policy</a>
</li>
<li class="nist-footer__menu-item">
<a href="https://www.nist.gov/summary-report-scientific-integrity">Scientific Integrity</a>
</li>
<li class="nist-footer__menu-item">
<a href="https://www.nist.gov/nist-information-quality-standards">Information Quality Standards</a>
</li>
<li class="nist-footer__menu-item">
<a href="https://www.commerce.gov/">Commerce.gov</a>
</li>
<li class="nist-footer__menu-item">
<a href="http://www.science.gov/">Science.gov</a>
</li>
<li class="nist-footer__menu-item">
<a href="http://www.usa.gov/">USA.gov</a>
</li>
<li class="nist-footer__menu-item">
<a href="https://vote.gov/">Vote.gov</a>
</li>
</ul>
</div>
</div>
</footer>
<!-- nist-index-ignore-end -->
</div>
</div>
<script type="application/json" data-drupal-selector="drupal-settings-json">{"path":{"baseUrl":"\/","pathPrefix":"","currentPath":"node\/1201386","currentPathIsAdmin":false,"isFront":false,"currentLanguage":"en"},"pluralDelimiter":"\u0003","suppressDeprecationErrors":true,"back_to_top":{"back_to_top_button_trigger":100,"back_to_top_speed":1200,"back_to_top_prevent_on_mobile":false,"back_to_top_prevent_in_admin":true,"back_to_top_button_type":"image","back_to_top_button_text":"Back to top"},"google_analytics":{"account":"G-HEQ0YF2VYL","trackOutbound":true,"trackMailto":true,"trackTel":true,"trackDownload":true,"trackDownloadExtensions":"7z|aac|arc|arj|asf|asx|avi|bin|bsh|c|csv|doc(x|m)?|dot(x|m)?|dw(fx|g|gd)|dxf|eps|epub|exe|f(90)|flv|gif|gz|gzip|hqx|jar|jpe?g|js|m1v|mp(2|3|4|e?g)|mobi|mov(ie)?|msi|msp|pdf|phps|pl|png|ppt(x|m)?|pot(x|m)?|pps(x|m)?|ppam|sld(x|m)?|thmx|qtm?|ra(m|r)?|rfa|rtf|rvt|sch|sea|sit|swf|tar|tgz|tif|txt|txz|wav|wma|wmv|wpd|wrl|xls(x|m|b)?|xlt(x|m)|xlam|xml|xsd|z|zip"},"nist_search":{"clickTracking":"search-report-click","isDebug":false,"clickTrackEnabled":true,"message":"NIST Search in debug mode. Check the browsers network inspector for Click Track reporting results..."},"data":{"extlink":{"extTarget":false,"extTargetNoOverride":false,"extNofollow":false,"extNoreferrer":false,"extFollowNoOverride":false,"extClass":"ext","extLabel":"(link is external)","extImgClass":false,"extSubdomains":true,"extExclude":"\\.gov\\\/|\\.mil\\\/|\\manufacturingusa\\.com\\\/","extInclude":"","extCssExclude":".ck-editor, .nist-video-thumbnail__lightbox-trigger, a.nist-icon--mail-blue","extCssExplicit":"","extAlert":true,"extAlertText":"Thank you for visiting NIST. We hope your visit was informative. We have provided a link to this site because it has information that may be of interest to our users. NIST does not necessarily endorse the views expressed or the facts presented on this site. Further, NIST does not endorse any commercial products that may be advertised or available on this site. Click OK to be directed to your link.","mailtoClass":"0","mailtoLabel":"(link sends email)","extUseFontAwesome":false,"extIconPlacement":"after","extFaLinkClasses":"fa fa-external-link","extFaMailtoClasses":"fa fa-envelope-o","whitelistedDomains":[]}},"user":{"uid":0,"permissionsHash":"bd6a443844dbe99b4e6942f3b1397526e760137efd2b1ee6b2d588fc414dff20"}}</script>
<script src="/sites/default/files/js/js_jDaFaXhHm6gPUKstNYX9eIyoQXghVs3g7rbR0QoqpYY.js?scope=footer&amp;delta=0&amp;language=en&amp;theme=nist_www&amp;include=eJxdjW0OwjAIhi805UiErtjhWFlatHp7O53RLOEHPLwfgcYZ3fqsEH47XuuQzJIyUiZ9uowVjmDIUh0v0lm0ltUoopceIjlBos-7irMsa7E7wxFsLW_mEy_ce00DFVwsQpRKoQer5PmtgaQWSE-7BSamyOV7YmvtT8EP34wQy20lPe_nC6DrXYU"></script>
<script src="https://siteimproveanalytics.com/js/siteanalyze_6017546.js" async></script>
<script src="/sites/default/files/js/js_709kuJyJYTt2lWrlwglvgNyqkgqlZSSNCLusQNdUubs.js?scope=footer&amp;delta=2&amp;language=en&amp;theme=nist_www&amp;include=eJxdjW0OwjAIhi805UiErtjhWFlatHp7O53RLOEHPLwfgcYZ3fqsEH47XuuQzJIyUiZ9uowVjmDIUh0v0lm0ltUoopceIjlBos-7irMsa7E7wxFsLW_mEy_ce00DFVwsQpRKoQer5PmtgaQWSE-7BSamyOV7YmvtT8EP34wQy20lPe_nC6DrXYU"></script>
<script type="text/javascript">window.NREUM||(NREUM={});NREUM.info={"beacon":"bam.nr-data.net","licenseKey":"37b7ccb661","applicationID":"1089704227","transactionName":"YFxUN0sADEdYVkBaClkWdwBNCA1aFkVVVABoWlcAUQQ=","queueTime":5,"applicationTime":33,"atts":"TBtXQQMaH0k=","errorBeacon":"bam.nr-data.net","agent":""}</script></body>
</html>
Reference in a new issue View git blame Copy permalink