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|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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|
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<a href="/artificial-intelligence" class="usa-nav__link">Artificial intelligence</a>
|
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|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/bioscience" class="usa-nav__link">Bioscience</a>
|
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|
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</li>
|
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|
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<li class="usa-nav__submenu-item">
|
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<a href="/buildings-construction" class="usa-nav__link">Buildings and construction</a>
|
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|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/chemistry" class="usa-nav__link">Chemistry</a>
|
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|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/cybersecurity" class="usa-nav__link">Cybersecurity</a>
|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/electronics" class="usa-nav__link">Electronics</a>
|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/energy" class="usa-nav__link">Energy</a>
|
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</li>
|
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</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
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<li class="usa-nav__submenu-item">
|
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<a href="/environment" class="usa-nav__link">Environment</a>
|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/fire" class="usa-nav__link">Fire</a>
|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/forensic-science" class="usa-nav__link">Forensic science</a>
|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/health" class="usa-nav__link">Health</a>
|
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</li>
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<li class="usa-nav__submenu-item">
|
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<a href="/information-technology" class="usa-nav__link">Information technology</a>
|
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</li>
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<li class="usa-nav__submenu-item">
|
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<a href="/infrastructure" class="usa-nav__link">Infrastructure</a>
|
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</li>
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<li class="usa-nav__submenu-item">
|
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<a href="/manufacturing" class="usa-nav__link">Manufacturing</a>
|
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</li>
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<li class="usa-nav__submenu-item">
|
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<a href="/materials" class="usa-nav__link">Materials</a>
|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/mathematics-statistics" class="usa-nav__link">Mathematics and statistics</a>
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</li>
|
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</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
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<li class="usa-nav__submenu-item">
|
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<a href="/metrology" class="usa-nav__link">Metrology</a>
|
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|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/nanotechnology" class="usa-nav__link">Nanotechnology</a>
|
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|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/neutron-research" class="usa-nav__link">Neutron research</a>
|
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|
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</li>
|
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|
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<li class="usa-nav__submenu-item">
|
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<a href="/performance-excellence" class="usa-nav__link">Performance excellence</a>
|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/physics" class="usa-nav__link">Physics</a>
|
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|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/public-safety" class="usa-nav__link">Public safety</a>
|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/quantum-information-science" class="usa-nav__link">Quantum information science</a>
|
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|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/resilience" class="usa-nav__link">Resilience</a>
|
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|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/standards" class="usa-nav__link">Standards</a>
|
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|
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</li>
|
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|
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<li class="usa-nav__submenu-item">
|
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<a href="/transportation" class="usa-nav__link">Transportation</a>
|
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|
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</li>
|
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|
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</ul>
|
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|
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</div>
|
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|
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</div>
|
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|
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</div>
|
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|
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</li>
|
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|
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<li class="usa-nav__primary-item">
|
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|
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<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-3"><span>Labs & Major Programs</span></button>
|
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<div id="primary_menu-3" class="usa-nav__submenu usa-megamenu">
|
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|
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<div class="grid-row">
|
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|
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<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
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|
|
<li class="usa-nav__submenu-item">
|
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|
|
<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>
|
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|
|
</ul>
|
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|
|
</li>
|
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|
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</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
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|
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<li class="usa-nav__submenu-item">
|
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|
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<a href="/user-facilities" class="usa-nav__link">User Facilities</a>
|
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|
|
<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>
|
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|
|
<li class="usa-nav__submenu-item">
|
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|
|
<a href="/labs-major-programs/research-test-beds" class="usa-nav__link">Research Test Beds</a>
|
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|
|
</li>
|
|||
|
|
<li class="usa-nav__submenu-item">
|
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|
|
<a href="/laboratories/projects-programs" class="usa-nav__link">Research Projects</a>
|
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|
|
</li>
|
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|
|
<li class="usa-nav__submenu-item">
|
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|
|
<a href="/laboratories/tools-instruments" class="usa-nav__link">Tools & Instruments</a>
|
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|
|
</li>
|
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|
|
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
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|
|
<li class="usa-nav__submenu-item">
|
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|
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<a href="/major-programs" class="usa-nav__link">Major Programs</a>
|
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|
|
<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>
|
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|
|
</div>
|
|||
|
|
</li>
|
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|
|
<li class="usa-nav__primary-item">
|
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|
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<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-4"><span>Services & Resources</span></button>
|
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|
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<div id="primary_menu-4" class="usa-nav__submenu usa-megamenu">
|
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|
|
<div class="grid-row">
|
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|
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<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
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|
|
<li class="usa-nav__submenu-item">
|
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|
|
<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>
|
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|
|
</li>
|
|||
|
|
<li>
|
|||
|
|
<a href="/sri" class="usa-nav__link">Standard Reference Instruments (SRIs)</a>
|
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|
|
</li>
|
|||
|
|
<li>
|
|||
|
|
<a href="/standardsgov" class="usa-nav__link">Standards.gov</a>
|
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|
|
</li>
|
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|
|
<li>
|
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|
|
<a href="/pml/time-and-frequency-division/time-services" class="usa-nav__link">Time Services</a>
|
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|
|
</li>
|
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|
|
<li>
|
|||
|
|
<a href="/pml/owm" class="usa-nav__link">Office of Weights and Measures</a>
|
|||
|
|
</li>
|
|||
|
|
</ul>
|
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|
|
</li>
|
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|
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</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
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<li class="usa-nav__submenu-item">
|
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|
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<a href="/services-resources/software" class="usa-nav__link">Software</a>
|
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|
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</li>
|
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|
|
<li class="usa-nav__submenu-item">
|
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|
|
<a href="/data" class="usa-nav__link">Data</a>
|
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|
|
<ul class="usa-nav__submenu-list">
|
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|
|
<li>
|
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|
|
<a href="https://webbook.nist.gov/chemistry/" class="usa-nav__link">Chemistry WebBook</a>
|
|||
|
|
</li>
|
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|
|
<li>
|
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|
|
<a href="https://nvd.nist.gov/" class="usa-nav__link">National Vulnerability Database</a>
|
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|
|
</li>
|
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|
|
<li>
|
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|
|
<a href="/pml/productsservices/physical-reference-data" class="usa-nav__link">Physical Reference Data</a>
|
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|
|
</li>
|
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|
|
<li>
|
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|
|
<a href="/srd" class="usa-nav__link">Standard Reference Data (SRD)</a>
|
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|
|
</li>
|
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|
|
</ul>
|
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|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="https://shop.nist.gov/" class="usa-nav__link">Storefront</a>
|
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</li>
|
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|
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<li class="usa-nav__submenu-item">
|
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|
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<a href="/tpo" class="usa-nav__link">License & Patents</a>
|
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|
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</li>
|
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|
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</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
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|
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<li class="usa-nav__submenu-item">
|
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|
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<a href="https://csrc.nist.gov/" class="usa-nav__link">Computer Security Resource Center (CSRC)</a>
|
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|
|
</li>
|
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|
|
<li class="usa-nav__submenu-item">
|
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|
|
<a href="/nist-research-library" class="usa-nav__link">NIST Research Library</a>
|
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|
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</li>
|
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|
|
</ul>
|
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|
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</div>
|
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|
|
</div>
|
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|
|
</div>
|
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|
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</li>
|
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|
|
<li class="usa-nav__primary-item">
|
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|
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<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-5"><span>News & Events</span></button>
|
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<div id="primary_menu-5" class="usa-nav__submenu usa-megamenu">
|
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<div class="grid-row">
|
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<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
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<li class="usa-nav__submenu-item">
|
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|
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<a href="/news-events/news" class="usa-nav__link">News</a>
|
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|
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</li>
|
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|
|
<li class="usa-nav__submenu-item">
|
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|
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<a href="/news-events/events" class="usa-nav__link">Events</a>
|
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|
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</li>
|
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|
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<li class="usa-nav__submenu-item">
|
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|
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<a href="/blogs" class="usa-nav__link">Blogs</a>
|
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|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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|
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<a href="/feature-stories" class="usa-nav__link">Feature Stories</a>
|
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|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/awards" class="usa-nav__link">Awards</a>
|
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</li>
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</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
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<li class="usa-nav__submenu-item">
|
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<a href="/video-gallery" class="usa-nav__link">Video Gallery</a>
|
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</li>
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<li class="usa-nav__submenu-item">
|
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<a href="/image-gallery" class="usa-nav__link">Image Gallery</a>
|
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</li>
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<li class="usa-nav__submenu-item">
|
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<a href="/pao/media-contacts" class="usa-nav__link">Media Contacts</a>
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</li>
|
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|
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</ul>
|
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</div>
|
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</div>
|
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</div>
|
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</li>
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<li class="usa-nav__primary-item">
|
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<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-6"><span>About NIST</span></button>
|
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<div id="primary_menu-6" class="usa-nav__submenu usa-megamenu">
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<div class="grid-row">
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<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
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<li class="usa-nav__submenu-item">
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<a href="/about-nist" class="usa-nav__link">About Us</a>
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<ul class="usa-nav__submenu-list">
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<li>
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<a href="/director/leadership" class="usa-nav__link">Leadership</a>
|
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</li>
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<li>
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<a href="/director/nist-organization-structure" class="usa-nav__link">Organization Structure</a>
|
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<a href="/about-nist/budget-planning" class="usa-nav__link">Budget & Planning</a>
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</ul>
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<a href="/about-nist/contact-us" class="usa-nav__link">Contact Us</a>
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<li class="usa-nav__submenu-item">
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<a href="/about-nist/visit" class="usa-nav__link">Visit</a>
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<li class="usa-nav__submenu-item">
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<a href="/careers" class="usa-nav__link">Careers</a>
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|
|
<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>
|
|||
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|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<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-a42f1c610aceb1bb954054ae3d3d8ccfd450b258801244acc4d094d3249c97f4">
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<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>
|
|||
|
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<h1 class="nist-page__title">BT1-absorption</h1>
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<p>At the NCNR, we usually apply absorption corrections directly to diffraction data. Assuming one knows the neutron wavelength, approximate sample volume, mass and composition of the sample, (you really should know all of these,) the effects of absorption can be computed</p>
|
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<ol><li><strong>How much ab</strong>sorption do I have? You can plug the material composition, wavelength, thickness and density into the 'absorption and scattering' part of the<a href="https://www.ncnr.nist.gov/resources/activation/"> BT-7 calculator.</a> Incoherent scattering, like absorption, makes neutrons unavailable for diffraction, so sum all values in the "Scattering cross section" column to obtain a "Linear Attenuation Factor (LAF)" in units of cm<sup>-1</sup>. (Note that the thickness is not used in calculating the LAF using this calculator but is for the Neutron Transmission given under the outputted table.) Multiply this LAF by the sample radius in cm (common BT-1 can sizes: A: 0.3 cm, B: 0.46 cm, C: 0.54 cm, D: 0.62 cm, E: 0.78 cm). This provides a unit-less constant, "mu.R". <strong>When mu.R << 1, absorption is negligible</strong>. <strong>When mu.R <= 1, absorption will shift atomic displacement parameters </strong>("temperature parameters") somewhat, but corrections are probably not needed.<strong> If mu.R > 1, an absorption correction is certainly needed, </strong>but a better choice is to do the experiment better: Use a smaller diameter can, or even better use an annular can, to reduce the absorption effects and increase the scattering intensities.</li>
|
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<li>Obtain Absorption Correction Factors Using the "Mu.R" value, one can look up absorption correction factors for the cylindrical geometry (A*). <a href="https://archive.org/details/InternationalTablesForX-rayCrystallographyVol2/page/n309">Table 5.3.5B</a> in Volume II of the International Tables for X-Ray Crystallography (p. 295ff) tabulates A* for 0 <= mu.R <= 20, while Table 6.3.3.2 in Volume C of the International Tables for Crystallography (p. 523 in the 1995 ed.) tabulates A* for 0 <= mu.R <= 2.5. It is possible to compute absorption correction factors using the <a href="https://www.nist.gov/ncnr/dave-data-analysis-software">DAVE</a> program, for both cylindrical and annual geometries (see, "Planning tools" -> "Self-shielding" in the menu, plot self-shielding factors and take the reciprocal). OR run the supplied python script and select the closest value to your "Mu.R".</li>
|
|||
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<li> Fit the A* vs theta values to a Chebyshev polynomial Use the supplied Python fitting routine to extract the coefficients either through using the "Mu.R" selector or reading a file of A* values. Save the coefficients in your data directory with the name <strong><em>abs.corr</em></strong> [line 1: header, line 2: the number of Chebyshev terms, followed by the terms.) Rename .py and check your local pythonw location: <a class="media-link-ga " data-entity-substitution="canonical" data-entity-type="media" data-entity-uuid="7edda66d-4967-4e2a-ab1b-46180d806cdd" data-file-url="/system/files/documents/2019/09/06/absorption.py.txt" href="/document/absorptionpytxt" title="absorption.py.txt">absorption.py.txt</a></li>
|
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|
|
<li>Run <em>gformat</em> using the Chebyshev polynomial values To apply an absorption correction :
|
|||
|
|
<ul><li>Run <em>proprep</em> on the BT-1 file(s) to create .raw versions of the .bt1 files.:
|
|||
|
|
<pre>proprep file.bt1</pre>
|
|||
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|
|||
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<p>OR</p>
|
|||
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|
|||
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<pre>proprep file1.bt1 file2.bt1 ...</pre>
|
|||
|
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</li>
|
|||
|
|
<li>Run <em>gformat</em> on the .raw files, using the -a option to trigger the program to apply the absorption correction:
|
|||
|
|
<pre>gformat -a file.raw</pre>
|
|||
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|
|||
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<p>OR</p>
|
|||
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<pre>gformat -a -s file1.raw file2.raw ... </pre>
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Created September 5, 2019, Updated September 6, 2019
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