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]
Citation: 'transition' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.T06454 RIS BibTex EndNote
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Last revised: February 24, 2014