Bohr magneton

The Bohr magneton (symbol <math>\mu_B</math>), sometimes also called Landé factor, is named after the physicist Niels Bohr. It is a physical constant of magnetic moment[?], defined by:

<math>\mu_B = {{e \hbar} \over {2 m_e}}</math>

<math>e</math> is the elementary charge,

<math>\hbar</math> is the Dirac's constant,

<math>m_e</math> is the electron rest mass

In the SI system of units it's value is approximately:

<math>\mu_B</math> = 9.274 008 99(37) × 10^-24 J·T^-1