electron rest mass 

https://doi.org/10.1351/goldbook.E02008
Atomic fundamental physical constant used as atomic unit of mass, me=9.1093897(54)×10−31 kg.
Source:
CODATA Bull. 1986, 63, 1 [Terms] [Book]
Citation: 'electron rest mass' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.E02008 RIS BibTex EndNote
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Last revised: February 24, 2014