deactivation 

https://doi.org/10.1351/goldbook.D01528
Any loss of energy by an excited molecular entity.
See: emission, energy transfer (in photochemistry), internal conversion (in photochemistry), radiationless deactivation (in photochemistry), radiationless transition (in photochemistry), radiative transition (in photochemistry)
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2235 [Terms] [Paper]
Citation: 'deactivation' 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.D01528 RIS BibTex EndNote
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Last revised: February 24, 2014