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.
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The electron magnetic moment couples an electron's angular momentum to a magnetic field. Its intrinsic spin contribution isHere is the Bohr magneton, and 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 from tests how well a theory predicts an electron's interaction with its surroundings. The Dirac equation gives before radiative corrections; the anomalous magnetic moment makes a small correction experimentally accessible.[ref]
The magnetic moment of the electron by Polykarp Kusch. pp. 299–300: spin moment and Dirac prediction
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.