 Electron magnetic moment

The electron magnetic moment couples an electron's angular momentum to a magnetic field. Its intrinsic spin contribution isHere ${\mu }_B$ is the Bohr magneton, and $g_s$ is the positive electron spin g-factor under this sign convention. The minus sign makes magnetic dipole moment antiparallel to spin angular momentum. An electron in a chemical atom can also contribute an orbital magnetic dipole moment; the measured response of a whole atomic level combines these contributions.

Measuring a tiny departure of $g_s$ from $2$ tests how well a theory predicts an electron's interaction with its surroundings. The Dirac equation gives $g_s=2$ before radiative corrections; the anomalous magnetic moment makes a small correction experimentally accessible.^[ref] A useful strategy is to compare two atomic energy levels whose orbital and spin contributions have different weights, rather than trying to calibrate an absolute magnetic field more accurately.

The electron magnetic moment is a fundamental property of electrons that describes their behavior in a magnetic field. It can be thought of as a measure of the strength and orientation of an electron's intrinsic magnetic field, which is linked to its spin and charge. ### Key points about the electron magnetic moment: 1. **Intrinsic Property**: The electron magnetic moment arises from two key factors: the electron's electric charge and its spin. It is a quantum mechanical property that does not depend on the electron's motion.