{"term":{"id":"09198","title":"extended X-ray absorption fine structure spectroscopy","longtitle":"IUPAC Gold Book - extended X-ray absorption fine structure spectroscopy","doi":"10.1351\/goldbook.09198","code":"09198","status":"current","acronym":"<em>acronym<\/em>: EXAFS","definitions":[{"id":1,"text":"X-ray absorption fine structure spectroscopy in the energy region from the core-level edge to an energy several hundred $\\pu{eV}$ greater.","notes":{"1":"Extended X-ray absorption fine structure results mainly from the single scattering of the photoelectron from surrounding atoms and is exhibited as oscillations in the absorption cross section with increasing photon energy. Analysis of the oscillations provides information, through bond lengths, on the local chemical environment of the emitting atom.","2":"EXAFS has been used as an alternate term for the superordinate concept of XAFS."},"links":[{"term":"X-ray absorption fine structure spectroscopy","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/09212"}],"sources":["PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1790 (https:\/\/doi.org\/10.1515\/pac-2019-0404)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/09198\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/09198\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/09198\/plain"},"citation":"Citation: 'extended X-ray absorption fine structure 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.09198","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":"2026-05-18T05:29:40+00:00"}}