08611 IUPAC Gold Book - homogeneous line-broadening 10.1351/goldbook.08611 08611 current synonym: homogeneous broadening 1 Line-broadening by mechanisms that affect every molecule of the same species in the sample in the same way. Such mechanisms do not require an ensemble of spectroscopically non-equivalent molecules of the same species. Such mechanisms are the natural line width, which is usually negligible in vibrational spectroscopy, and intra- or inter- molecular interactions, including anharmonic vibrational interactions (see anharmonicity), that reduce the lifetime of the excited state. Line-broadening https://goldbook.iupac.org//terms/view/08503 anharmonicity https://goldbook.iupac.org//terms/view/08635 natural line width https://goldbook.iupac.org//terms/view/08641 vibrational spectroscopy https://goldbook.iupac.org//terms/view/08708 PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 748 (https://doi.org/10.1515/pac-2019-0203) https://goldbook.iupac.org/terms/view/08611/html https://goldbook.iupac.org/terms/view/08611/json https://goldbook.iupac.org/terms/view/08611/plain Citation: 'homogeneous line-broadening' 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.08611 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. 2026-06-28T14:56:58+00:00