Term: energy transfer plot https://doi.org/10.1351/goldbook.E02117 Definition: A plot of the quenching rate constant of an excited molecular entity by a series of quenchers versus the excited state energy of the quenchers. Alternatively, a plot of the rate constant for the sensitization of a reaction versus the excited state energy of different sensitizers. This type of plot is used to estimate the energy of the excited molecular entity quenched (in the former case) or produced (in the latter case). Related Terms: 1) stern–volmer kinetic relationships (http://doi.org/10.1351/goldbook.S06004). 2) quenching (http://doi.org/10.1351/goldbook.Q05007). 3) rate constant (http://doi.org/10.1351/goldbook.O04322). 4) excited state (http://doi.org/10.1351/goldbook.E02257). 5) sensitization (http://doi.org/10.1351/goldbook.S05607). Source: PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2240 (https://doi.org/10.1351/pac199668122223) Citation: 'energy transfer plot' 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.E02117 License: 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. Disclaimer: 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.