08657 IUPAC Gold Book - pATR spectrum 10.1351/goldbook.08657 08657 current 1 \(-\log_{10}\) of the spectrum obtained in attenuated total reflection spectroscopy. The term is used to avoid the confusing, but common and incorrect, practice of calling it the absorbance spectrum. attenuated total reflection spectroscopy https://goldbook.iupac.org/terms/view/08573 spectrum https://goldbook.iupac.org/terms/view/08291 PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 759 (https://doi.org/10.1515/pac-2019-0203) https://goldbook.iupac.org/terms/view/08657/html https://goldbook.iupac.org/terms/view/08657/json https://goldbook.iupac.org/terms/view/08657/plain Citation: 'pATR spectrum' 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.08657 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. 2026-06-30T23:19:11+00:00