06504 IUPAC Gold Book - triplet-triplet absorption 10.1351/goldbook.T06504 T06504 current 1 Absorption which takes place with the transition from the lowest triplet state of the molecule to higher triplet states (T → \(T_{n}\)) thus leading to the triplet-triplet absorption spectrum. Absorption https://goldbook.iupac.org//terms/view/A00036 absorption spectrum https://goldbook.iupac.org//terms/view/A00043 triplet state https://goldbook.iupac.org//terms/view/T06503 PAC, 1984, 56, 231. 'Nomenclature, symbols, units and their usage in spectrochemical analysis-Part VI: molecular luminescence spectroscopy' on page 234 (https://doi.org/10.1351/pac198456020231) https://goldbook.iupac.org/terms/view/T06504/html https://goldbook.iupac.org/terms/view/T06504/json https://goldbook.iupac.org/terms/view/T06504/plain Citation: 'triplet-triplet absorption' 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.T06504 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. 2026-06-20T19:02:09+00:00