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Chemical Process and Nuclear Measurements Group

The Chemical Process and Nuclear Measurements Group performs state-of-the art chemical and physical measurements to provide reference data, develop standards and models, and advance chemical measurement science and the fundamental understanding of chemical systems.


TEM Aerosol
Transmission electron microscopy (TEM) images of aerosol reference material candidates

The Chemical Process and Nuclear Measurement Group (CPNMG) performs state-of-the-art chemical and physical measurements to provide reference data, develop standards and models, and advance fundamental chemical measurement science.  The CPNMG performs research to elucidate reaction mechanisms and time-dependent phenomena; for example, the measurement of rate constants, transport properties, and the transformation of complex chemical systems by investigating composition, electronic and structural properties as they relate to chemical and physical functions.  The group compiles, critically evaluates, and disseminates reference methods, data, and Standard Reference Materials.  Additionally, the group maintains facilities and expertise in nuclear methods for elemental analysis in collaboration with the NIST Center for Neutron Research and external partners.  The research focuses on areas of national and industrial needs such as those related to energy, manufacturing, security, and the environment. Group members are engaged with international standards development organizations and other National Metrology Institutes to establish comparability of measurement capabilities.

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News and Updates

Latest Publications

Binary Metal-Carbon Phase-Transition Temperatures

Donald R. Burgess Jr.
In this work, we compiled and evaluated eutectic and peritectic phase-transition temperatures for metal-carbon (e.g., Co-C, Re-C) and metal carbide-carbon

Melting Points and Boiling Points for the Alkali Metals

Nikhila Narayana, Donald R. Burgess Jr.
In this work, we compiled, evaluated, and select recommended values for use for the melting points and boiling points of the alkali metals: lithium (Li), sodium

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Press Coverage

What’s inside all those masks?

Washington Post
Research conducted by scientists at NIST and the Smithsonian’s Museum Conservation Institute show that the humidity in your breath may improve the performance


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