88 Spin-Orbit Coupling

The interaction between a particle’s orbital angular momentum and its spin angular momentum, coupling its spatial motion with its intrinsic spin.

definition [d] (Spin-Orbit Coupling) — Interaction between a particle’s intrinsic spin and its orbital angular momentum, often expressed as an L·S term. Ref: Arfken, Weber & Harris, Mathematical Methods for Physicists, 7th ed. (2013) [citing Condon & Shortley, Theory of Atomic Spectra]; “illinois-covariant-contravariant.pdf”.