Term: diabatic photoreaction
https://doi.org/10.1351/goldbook.D01660

Definition:
Within the Born–Oppenheimer approximation, a reaction beginning on one excited state 'potential-energy surface' and ending, as a result of radiationless transition, on another surface, usually that of the ground state. Also called non-adiabatic.

Related Terms:
1) adiabatic photoreaction (http://doi.org/10.1351/goldbook.A00145).
2) excited state (http://doi.org/10.1351/goldbook.E02257).
3) radiationless transition (http://doi.org/10.1351/goldbook.R05057).
4) ground state (http://doi.org/10.1351/goldbook.G02704).
5) adiabatic (http://doi.org/10.1351/goldbook.A00141).

Source: PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2235 (https://doi.org/10.1351/pac199668122223)

Citation: 'diabatic photoreaction' 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.D01660

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