OAM

The “rotation” of an electron from one orbital to another generates Orbital Angular Momentum (OAM). This rotation must happen at the same energy (degeneracy) and with one hole with the same spin as the \(e^-\). A half-filled subshell (all \(m\) orbitals are filled) allows no OAM since there are no holes with the same \(m\) and \(s\).

OAM is usually ignored in many calculations (e.g. magnetization) because of quenching.

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