Term: triplet-triplet absorption
https://doi.org/10.1351/goldbook.T06504

Definition:
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.

Related Terms:
1) absorption (http://doi.org/10.1351/goldbook.A00036).
2) triplet state (http://doi.org/10.1351/goldbook.T06503).
3) absorption spectrum (http://doi.org/10.1351/goldbook.A00043).

Source: 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)

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. https://doi.org/10.1351/goldbook.T06504

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.