Title: total internal reflection Long Title: IUPAC Gold Book - total internal reflection DOI: 10.1351/goldbook.08700 Status: current Definition Internal reflection from a non-absorbing material at angles of incidence at or above the critical angle. Source - PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 767 (https://doi.org/10.1515/pac-2019-0203) Other Outputs - html: https://goldbook.iupac.org/terms/view/08700/html - json: https://goldbook.iupac.org/terms/view/08700/json - xml: https://goldbook.iupac.org/terms/view/08700/xml Citation: Citation: 'total internal 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.08700 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. Collection: If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . 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. Accessed: 2026-07-26T18:27:09+00:00