{"term":{"id":"08702","title":"transflection","longtitle":"IUPAC Gold Book - transflection","doi":"10.1351\/goldbook.08702","code":"08702","status":"current","definitions":[{"id":1,"text":"Reflection absorption at near-normal incidence when the thickness of the absorbing medium is large enough to yield an interpretable spectrum. The substrate is usually a mirror for mid-infrared measurements and a ceramic disk for near-infrared measurements. The angle of incidence is typically between \\(\\pu{0\\!^{\\circ}}\\) and \\(\\pu{45\\!^{\\circ}}\\).","notes":{"1":"Transflection is widely used in IR microscopy and is particularly convenient for measuring transmission-like spectra in a near-infrared instrument configured for diffuse reflection measurements by mounting the sample on a non-absorbing diffusely reflecting substrate."},"links":[{"term":"angle of incidence","url":"https:\/\/goldbook.iupac.org\/terms\/view\/08222"},{"term":"diffuse reflection","url":"https:\/\/goldbook.iupac.org\/terms\/view\/08236"},{"term":"normal incidence","url":"https:\/\/goldbook.iupac.org\/terms\/view\/08647"},{"term":"spectrum","url":"https:\/\/goldbook.iupac.org\/terms\/view\/08291"}],"sources":["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)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/08702\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/08702\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/08702\/plain"},"citation":"Citation: 'transflection' 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.08702","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":"2026-06-28T00:18:30+00:00"}}