spin-orbit splitting

https://doi.org/10.1351/goldbook.S05872
Removal of state degeneracy by spin-orbit coupling.
Source:
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2277 (https://doi.org/10.1351/pac199668122223)