What is "bohr magneton"

n. (context physics English) a unit that expresses the magnetic moment of the electron

The value of Bohr magneton

system of units

value

unit

SI {{cite web

title=CODATA value: Bohr magneton

url=http://physics.nist.gov/cgi-bin/cuu/Value?mub

CGS {{cite book

first=Robert C. |last=O'Handley

year=2000

eV {{cite web

title=CODATA value: Bohr magneton in eV/T

url=http://physics.nist.gov/cgi-bin/cuu/Value?mubev

atomic units

height=30|

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

The Bohr magneton is defined in SI units by

$$\mu_\mathrm{B} = \frac{e \hbar}{2 m_\mathrm{e}}$$

and in Gaussian CGS units by

$$\mu_\mathrm{B} = \frac{e \hbar}{2 m_\mathrm{e} c}$$

where

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

The electron magnetic moment, which is the electron's intrinsic spin magnetic moment, is approximately one Bohr magneton.