transition

https://doi.org/10.1351/goldbook.T06454
See:
n → σ* transition
,
π → π* transition
,
π → σ* transition
,
σ → σ* transition
Source:
PAC, 1988, 60, 1055. (Glossary of terms used in photochemistry (Recommendations 1988)) on page 1079 [Terms] [Paper]