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Results of Keyword Search: 1 database found for deuteron electron mass ratio. SRD 121 NIST CODATA Fundamental Physical Constants (Web, free access)   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 expressing the uncertainty of measurement results. Last modified: November 6, 2008 (Created: November 9, 2001) For questions or comments: Contact Us