Bohr magneton 

https://doi.org/10.1351/goldbook.B00692
Electromagnetic fundamental physical constant: μB=e ℏ2 me=9.2740154(31)×10−24 J T−1 where e is the elementary charge, ℏ the Planck constant divided by 2 π and me the electron rest mass.
Source:
CODATA Bull. 1986, 63, 1 [Terms] [Book]
Citation: 'Bohr magneton' 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.B00692 RIS BibTex EndNote
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Last revised: February 24, 2014