fine structure constant, α 

https://doi.org/10.1351/goldbook.F02389
Atomic fundamental physical constant, α=μ0 e2 c02 h=7.297 353 08 (33)×10−3, where μ0 is the permeability of vacuum, e the elementary charge, h the Planck constant, and c0 the speed of light.
Source:
CODATA Bull. 1986, 63, 1 [Terms] [Book]
Citation: 'fine structure constant' 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.F02389 RIS BibTex EndNote
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Last revised: February 24, 2014