• Organization: National Institute of Standards and Technology
• Updated: 2014-01-01 00:00:00

This site, developed in the Physics Laboratory at NIST, addresses three topics: fundamental physical constants, the International System of Units (SI), which is the modern metric system, and...

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• Organization: National Institute of Standards and Technology
• Updated: 2014-01-01 00:00:00

This bibliographic database contains citations for the most important theoretical and experimental publications relevant to the fundamental constants and closely related precision measurements...

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• Organization: National Institute of Standards and Technology
• Updated: 2005-08-01 00:00:00

This X-ray transition table provides the energies and wavelengths for the K and L transitions connecting energy levels having principal quantum numbers n = 1, 2, 3, and 4. The elements covered...

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