Bohr magneton

In atomic physics, the Bohr magneton (symbol $μ B$ ) is a physical constant and the natural unit for expressing the magnetic moment of an electron caused by its orbital or spin angular momentum. In SI units, the Bohr magneton is defined as

\mu _{\mathrm {B} }={\frac {e\hbar }{2m_{\mathrm {e} }}}

The value of the Bohr magneton
System of units	Value	Unit
SI	9.2740100783(28)×10⁻²⁴	J·T⁻¹
Gaussian	9.2740100783(28)×10⁻²¹	erg·G⁻¹
eV/T	5.7883818060(17)×10⁻⁵	eV·T⁻¹
atomic units	1/2	eħ/m_e

and in the Gaussian CGS units as

\mu _{\mathrm {B} }={\frac {e\hbar }{2m_{\mathrm {e} }c}},

where

$e$ is the elementary charge,
$ħ$ is the reduced Planck constant,
$m e$ is the electron mass,
$c$ is the speed of light.

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