Rydberg constant
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https://doi.org/10.1351/goldbook.R05430
Atomic fundamental physical constant R ∞ = E h 2 h c 0 = 1.097 373 15, where E h is the Hartree energy, h the Planck constant, and c0 the speed of light.
Source:
CODATA Bull. 1986,
63
, 1 (https://doi.org/10.6028/jres.092.010)