08642 IUPAC Gold Book - near-infrared radiation 10.1351/goldbook.08642 08642 current synonym: near-IR 1 Infrared radiation of which vacuum wavenumbers range from approximately \(\pu{12800 cm-1}\) to \(\pu{4800 cm-1}\) and wavelengths range from approximately \(\pu{780 nm}\) to \(\pu{2500 nm}\). The region is often divided into the silicon region between \(\pu{12800 cm-1}\) and \(\pu{9000 cm-1}\) (\(\pu{800 nm}\) and \(\pu{1100 nm}\)) and the lead sulfide region between \(\pu{9000 cm-1}\) and \(\pu{4000 cm-1}\) (\(\pu{1100 nm}\) and \(\pu{2500 nm}\)), where the names reflect the common detector for the region. Infrared radiation https://goldbook.iupac.org//terms/view/08617 vacuum wavenumbers https://goldbook.iupac.org//terms/view/08302 wavelengths https://goldbook.iupac.org//terms/view/08299 PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 755 (https://doi.org/10.1515/pac-2019-0203) https://goldbook.iupac.org/terms/view/08642/html https://goldbook.iupac.org/terms/view/08642/json https://goldbook.iupac.org/terms/view/08642/plain Citation: 'near-infrared radiation' 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.08642 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. 2026-05-30T23:25:10+00:00