{"term":{"id":"08618","title":"infrared spectroscopy","longtitle":"IUPAC Gold Book - infrared spectroscopy","doi":"10.1351\/goldbook.08618","code":"08618","status":"current","definitions":[{"id":1,"text":"Measurement principle of vibrational spectroscopy using infrared radiation.","notes":{"1":"Without qualification, 'infrared spectroscopy' usually refers to use of the mid-infrared (wavelength range \\(\\pu{2.5}\\) to \\(\\pu{25 \\upmu m}\\), wavenumber range (\\(\\pu{4000 cm-1}\\) to \\(\\pu{400 cm-1}\\)) region of the electromagnetic spectrum (see table)."},"links":[{"term":"infrared radiation","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/08617"},{"term":"vibrational spectroscopy","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/08708"},{"term":"wavelength","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/08300"},{"term":"wavenumber","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/08302"}],"sources":["PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 750 (https:\/\/doi.org\/10.1515\/pac-2019-0203)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/08618\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/08618\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/08618\/plain"},"citation":"Citation: 'infrared spectroscopy' 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.08618","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":"2026-06-05T01:40:06+00:00"}}