{"term":{"id":"05341","title":"resonance line","longtitle":"IUPAC Gold Book - resonance line","doi":"10.1351\/goldbook.R05341","code":"R05341","status":"current","also defines":"<em>also defines<\/em>: resonance emission","definitions":[{"id":1,"text":"The radiative decay of an excitation level may proceed to the neutral ground state and would thus occur at the same energy as the corresponding line in the absorption spectrum. Such a line is called a resonance line and the process is called resonance emission.","contexts":[],"links":[{"term":"absorption spectrum","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/A00043"},{"term":"ground state","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/G02704"},{"term":"resonance","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/R05326"}],"sources":["PAC, 1991, 63, 735. 'Nomenclature, symbols, units and their usage in spectrochemical analysis - VIII. Nomenclature system for X-ray spectroscopy (Recommendations 1991)' on page 739 (https:\/\/doi.org\/10.1351\/pac199163050735)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/R05341\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/R05341\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/R05341\/plain"},"citation":"Citation: 'resonance line' 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.R05341","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":"2026-05-18T08:44:54+00:00"}}