02115 IUPAC Gold Book - energy threshold 10.1351/goldbook.E02115 E02115 current 1 The limiting kinetic energy of a incident particle or energy of an incident photon below which a specified process cannot take place. kinetic energy https://goldbook.iupac.org//terms/view/K03402 PAC, 1994, 66, 2513. 'Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)' on page 2519 (https://doi.org/10.1351/pac199466122513) https://goldbook.iupac.org/terms/view/E02115/html https://goldbook.iupac.org/terms/view/E02115/json https://goldbook.iupac.org/terms/view/E02115/plain Citation: 'energy threshold' 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.E02115 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. 2026-05-09T09:34:12+00:00