07492 IUPAC Gold Book - ultraviolet 10.1351/goldbook.UT07492 UT07492 current initialism: UV mentioned: CIE, UV-B, UV-C, VUV, UV-A 1 Region of the electromagnetic spectrum extending from about \(100\ \rm{nm}\) to \(400\ \rm{nm}\). This region is divided into four sub-bands as follows: Vacuum UV (VUV) \(100{-}200\ \rm{nm}\)UV-C \(200{-}280\ \rm{nm}\)UV-B\(280{-}315\ \rm{nm}\)UV-A\(315{-}400\ \rm{nm}\). The notation and the limits of the various regions are as recommended by the International Commission on Illumination (CIE), with the exception that in these recommendations the UV-C range is \(100{-}280\ \rm{nm}\), including thus the vacuum UV range. PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 437 (https://doi.org/10.1351/pac200779030293) https://goldbook.iupac.org/terms/view/UT07492/html https://goldbook.iupac.org/terms/view/UT07492/json https://goldbook.iupac.org/terms/view/UT07492/plain Citation: 'ultraviolet' 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.UT07492 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. 2026-05-18T03:41:21+00:00