https://doi.org/10.1351/goldbook.R05430
Atomic fundamental physical constant R=Eh2 h c0=1.097 373 1534 (13)×107 m1, where Eh is the Hartree energy, h the Planck constant, and c0 the speed of light.
Source:
CODATA Bull. 1986, 63, 1 [Terms] [Book]