14084 IUPAC Gold Book - relative photonic efficiency 10.1351/goldbook.14084 14084 current 1 Ratio of the photonic efficiency (\(\xi\)) of a chemical process to the corresponding photonic efficiency of a standard process under otherwise identical conditions in the same reactor configuration and operation. For measurements carried out at constant photon flux, \(\xi_{\rm{rel}}\) can be estimated as the ratio of the corresponding reaction initial rates (for \(t \to 0\)), determined under identical conditions. Protocols for the determination of \(\xi_{\rm{rel}}\) have been reported. See the restrictions about the determination of quantum yields in photocatalysis mentioned in the Introduction of the source IUPAC Recommendation. photonic efficiency https://goldbook.iupac.org//terms/view/14057 PAC, 2011, 83, 931. 'Glossary of terms used in photocatalysis and radiation catalysis (IUPAC Recommendations 2011)' on page 986 (https://doi.org/10.1351/PAC-REC-09-09-36) https://goldbook.iupac.org/terms/view/14084/html https://goldbook.iupac.org/terms/view/14084/json https://goldbook.iupac.org/terms/view/14084/plain Citation: 'relative photonic efficiency' 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.14084 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. 2026-05-07T00:07:39+00:00