01654 IUPAC Gold Book - Dexter excitation transfer 10.1351/goldbook.D01654 D01654 current synonym: electron exchange excitation transfer 1 Excitation transfer occurring as a result of an electron exchange mechanism. It requires an overlap of the wavefunctions of the energy donor and the energy acceptor. It is the dominant mechanism in triplet-triplet energy transfer. The transfer rate constant, \(k_{\mathrm{ET}}\), is given by: \[k_{\rm{ET}}\propto \frac{h}{2\ \pi }\ P^{2}\ J\ \rm{e}^{\frac{-2\ r}{L}}\] where \(r\) is the distance between donor (D) and acceptor (A), \(L\) and \(P\) are constants not easily related to experimentally determinable quantities, and \(J\) is the spectral overlap integral. For this mechanism the spin conservation rules are obeyed. Excitation transfer https://goldbook.iupac.org//terms/view/E02256 radiative energy transfer https://goldbook.iupac.org//terms/view/R05063 rate constant https://goldbook.iupac.org//terms/view/O04322 spectral overlap https://goldbook.iupac.org//terms/view/S05818 triplet-triplet energy transfer https://goldbook.iupac.org//terms/view/T06506 PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2235 (https://doi.org/10.1351/pac199668122223) https://goldbook.iupac.org/terms/view/D01654/html https://goldbook.iupac.org/terms/view/D01654/json https://goldbook.iupac.org/terms/view/D01654/plain Citation: 'Dexter excitation transfer' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.D01654 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-05-28T04:02:44+00:00