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|
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<a href="/chemistry" class="usa-nav__link">Chemistry</a>
|
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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 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 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 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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<a href="/mathematics-statistics" class="usa-nav__link">Mathematics and statistics</a>
|
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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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<a href="/nanotechnology" class="usa-nav__link">Nanotechnology</a>
|
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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 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 class="usa-nav__submenu-item">
|
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<a href="/physics" class="usa-nav__link">Physics</a>
|
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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 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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<li class="usa-nav__submenu-item">
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<a href="/resilience" class="usa-nav__link">Resilience</a>
|
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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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<li class="usa-nav__submenu-item">
|
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<a href="/transportation" class="usa-nav__link">Transportation</a>
|
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</li>
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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-3"><span>Labs & Major Programs</span></button>
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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>
|
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</li>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/laboratories" class="usa-nav__link">Laboratories</a>
|
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<ul class="usa-nav__submenu-list">
|
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<li>
|
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<a href="/ctl" class="usa-nav__link">Communications Technology Laboratory</a>
|
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|
</li>
|
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<li>
|
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|
<a href="/el" class="usa-nav__link">Engineering Laboratory</a>
|
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</li>
|
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<li>
|
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<a href="/itl" class="usa-nav__link">Information Technology Laboratory</a>
|
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|
</li>
|
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<li>
|
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<a href="/mml" class="usa-nav__link">Material Measurement Laboratory</a>
|
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|
</li>
|
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<li>
|
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<a href="/pml" class="usa-nav__link">Physical Measurement Laboratory</a>
|
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|
</li>
|
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</ul>
|
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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="/user-facilities" class="usa-nav__link">User Facilities</a>
|
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|
<ul class="usa-nav__submenu-list">
|
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|
<li>
|
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|
<a href="/ncnr" class="usa-nav__link">NIST Center for Neutron Research</a>
|
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</li>
|
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|
<li>
|
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|
<a href="/cnst" class="usa-nav__link">CNST NanoFab</a>
|
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</li>
|
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</ul>
|
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</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>
|
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|
<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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<a href="/major-programs" class="usa-nav__link">Major Programs</a>
|
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|
<ul class="usa-nav__submenu-list">
|
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|
<li>
|
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<a href="/baldrige" class="usa-nav__link">Baldrige Performance Excellence Program</a>
|
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|
</li>
|
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|
<li>
|
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|
<a href="/chips" class="usa-nav__link">CHIPS for America Initiative</a>
|
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|
</li>
|
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|
<li>
|
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|
<a href="/mep" class="usa-nav__link">Manufacturing Extension Partnership (MEP)</a>
|
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|
</li>
|
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|
<li>
|
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|
<a href="/oam" class="usa-nav__link">Office of Advanced Manufacturing</a>
|
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|
</li>
|
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|
<li>
|
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|
<a href="/spo" class="usa-nav__link">Special Programs Office</a>
|
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|
</li>
|
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|
<li>
|
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|
<a href="/tpo" class="usa-nav__link">Technology Partnerships Office</a>
|
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|
</li>
|
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|
</ul>
|
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|
</li>
|
|||
|
</ul>
|
|||
|
</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-4"><span>Services & Resources</span></button>
|
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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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<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>
|
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|
<ul class="usa-nav__submenu-list">
|
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|
<li>
|
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|
<a href="/calibrations" class="usa-nav__link">Calibration Services</a>
|
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|
</li>
|
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|
<li>
|
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|
<a href="/nvlap" class="usa-nav__link">Laboratory Accreditation (NVLAP)</a>
|
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|
</li>
|
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|
<li>
|
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<a href="/nist-quality-system" class="usa-nav__link">Quality System</a>
|
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|
</li>
|
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|
<li>
|
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|
<a href="/srm" class="usa-nav__link">Standard Reference Materials (SRMs)</a>
|
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|
</li>
|
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|
<li>
|
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|
<a href="/sri" class="usa-nav__link">Standard Reference Instruments (SRIs)</a>
|
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|
</li>
|
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|
<li>
|
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|
<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>
|
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<a href="/pml/owm" class="usa-nav__link">Office of Weights and Measures</a>
|
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|
</li>
|
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|
</ul>
|
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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="/services-resources/software" class="usa-nav__link">Software</a>
|
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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>
|
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|
</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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|
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</ul>
|
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|
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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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<a href="/tpo" class="usa-nav__link">License & Patents</a>
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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="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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</li>
|
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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-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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<a href="/news-events/news" class="usa-nav__link">News</a>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/news-events/events" class="usa-nav__link">Events</a>
|
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</li>
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<li class="usa-nav__submenu-item">
|
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<a href="/blogs" class="usa-nav__link">Blogs</a>
|
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<li class="usa-nav__submenu-item">
|
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<a href="/feature-stories" class="usa-nav__link">Feature Stories</a>
|
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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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</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 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 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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</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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<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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<a href="/director/nist-organization-structure" class="usa-nav__link">Organization Structure</a>
|
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<li>
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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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<li class="usa-nav__submenu-item">
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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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<a href="/careers" class="usa-nav__link">Careers</a>
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<li>
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<a href="/iaao/academic-affairs-office" class="usa-nav__link">Student programs</a>
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</ul>
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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="/about-nist/work-nist" class="usa-nav__link">Work with NIST</a>
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<li class="usa-nav__submenu-item">
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<a href="/history" class="usa-nav__link">History</a>
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<ul class="usa-nav__submenu-list">
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<li>
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<a href="http://nistdigitalarchives.contentdm.oclc.org/" class="usa-nav__link">NIST Digital Archives</a>
|
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<li>
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<a href="/nist-museum" class="usa-nav__link">NIST Museum</a>
|
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<li>
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<a href="/nist-and-nobel" class="usa-nav__link">NIST and the Nobel</a>
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</ul>
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<a href="/education" class="usa-nav__link">Educational Resources</a>
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</div>
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</div>
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</ul>
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</div>
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</nav>
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</header>
|
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|
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</div>
|
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|
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|
<div class="grid-container">
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</div>
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|
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|
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|
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|
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|
<div
|
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|
id="block-nist-www-content" class="nist-block"
|
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>
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|
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|
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|
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|
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|
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|
<section
|
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<h1 class="nist-page__title">NG7 Horizontal Neutron Reflectometer</h1>
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<p>
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</p><figure class=" align-right nist-image--lightbox nist-image" role="group">
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<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/ncnr/ng7_1.jpg?itok=tO91dbAw" data-media-id="223996">
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<img height="165" loading="lazy" src="/sites/default/files/styles/220_x_220_limit/public/images/ncnr/ng7_1.jpg?itok=kl2pjMHa" typeof="foaf:Image" width="220">
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<figcaption class="nist-image__caption">Side view of the NG7 Horizontal Reflectometer</figcaption>
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</figure>
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Neutron reflectometry is a relatively new technique for investigating the near-surface structure of many materials. Specifically, it probes the neutron scattering density at depths of up to several thousand Å, with an effective depth resolution of a few Å. What is measured is the profile of reflectivity as a function of angle beyond the critical angle for total external reflection. The sample must thus present a smooth, flat surface, preferably several cm<sup>2</sup> in area. The method is extensively used for studies of polymer surfaces, Langmuir-Blodgett films, and thin films and multilayers of metals and semiconductors, both magnetic and non-magnetic.
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<p>The cold neutron reflectometer permits routine measurement of reflectivities as low as 10<sup>-6</sup> in typical run times of a few hours. As shown in the schematic drawing below, a pyrolytic graphite monochromator array deflects neutrons onto a horizontal sample surface at a shallow angle ofincidence. Reflected neutrons are measured by a detector after passing through an exit slit system.</p>
|
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<p>Independent movement of both sample and detector allows measurement of off-specular scattering. A position-sensitive detector permits simultaneous measurement of specular and off-specular scattering. </p>
|
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<h2
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class="nist-block__title"
|
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>Specifications/Capabilities</h2>
|
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|
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<div class="text-long"><p><img src="https://ncnr.nist.gov/instruments/ng7refl/setup.PNG"></p>
|
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|
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<ul><li>Pyrolytic graphite monochromator</li>
|
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<li>Wavelength range: 0.235, 0.407, 0.47, and 0.55 nm</li>
|
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|
<li>Wavelength resolution: 2.5% delta lambda/lambda</li>
|
|||
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<li>Beam size (continuously variable): .05 x 50 mm to 4 x 50 mm</li>
|
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|
<li>Q range: 0.03 to 2.4 nm<sup>-1</sup></li>
|
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<li>Incident neutron wavelength λ = 4.75 A</li>
|
|||
|
<li>Q resolution: Variable with slits from .02 to .15 delta Q/Q</li>
|
|||
|
<li>Monochromator-to-sample distance: 2m</li>
|
|||
|
<li>Sample-to-detector distance for reflectivity detector: 2m</li>
|
|||
|
<li>Sub Å thickness resolution</li>
|
|||
|
<li>In situ capabilities including:
|
|||
|
<ul><li>Liquid cells</li>
|
|||
|
<li><a href="http://www.ncnr.nist.gov/userlab/e137_frames.html#trough">Langmuir-Blodgett trough</a></li>
|
|||
|
<li><a href="http://www.ncnr.nist.gov/userlab/e137_frames.html#table">Vibration isolation stage</a></li>
|
|||
|
<li>Pressure cell (up to 3000 Psi)</li>
|
|||
|
<li>Multi sample changer</li>
|
|||
|
<li>High Temperature Cell</li>
|
|||
|
</ul></li>
|
|||
|
</ul></div>
|
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<a href="https://www.ncnr.nist.gov/programs/reflect/NR_article/index.html">Reflectometry Formalism</a>
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<div class="text-italic font-sans-2xs">
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Created October 4, 2018, Updated November 15, 2019
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