08227 IUPAC Gold Book - attenuated total reflection 10.1351/goldbook.08227 08227 current initialism: ATR synonym: frustrated total internal reflection 1 Internal reflection from an absorbing material at angles of incidence at or above the critical angle. Internal reflection https://goldbook.iupac.org/terms/view/08623 angles of incidence https://goldbook.iupac.org/terms/view/08222 attenuated total reflection spectroscopy https://goldbook.iupac.org/terms/view/08573 critical angle https://goldbook.iupac.org/terms/view/08584 multiple attenuated total reflection https://goldbook.iupac.org/terms/view/08271 PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 652 (https://doi.org/10.1515/pac-2019-0203) https://goldbook.iupac.org/terms/view/08227/html https://goldbook.iupac.org/terms/view/08227/json https://goldbook.iupac.org/terms/view/08227/plain Citation: 'attenuated total reflection' 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.08227 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. 2026-06-28T22:47:16+00:00