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Encyclopedia > LS coupling
#REDIRECTAngular momentum coupling

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LS coupling - LScoupling (1160 words)
The angular momentum coupling terms are the terms of the total Hamiltonian which do not commute with the subsystem individual angular momenta (or are not invariant with respect to the rotations of the subsystems).
The spin-spin coupling that exists between nuclear spin and electronic spin is responsible for the atomic hyperfine structure.
Spin-spin coupling or spin-spin splitting is the coupling of the spin angular momentum states of different particles.
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