Title: X-ray absorption near edge structure
Long Title: IUPAC Gold Book - X-ray absorption near edge structure
DOI: 10.1351/goldbook.08768
Status: current

Definition
Measurement method of X-ray absorption analysis in which the fine structure of the adsorption spectrum in the range \(\pu{30 eV}\) below to \(\pu{50 eV}\) above the absorption edge is used to measure parameters describing the chemical state, coordination environment, and local geometry distortion for the X-ray absorbing atom.

Notes
1) The method uses synchrotron radiation.
2) The wavelength of the emitted photoelectrons is longer than the interatomic distances between the absorbing atom and its nearest neighbours.

Related Terms
- X-ray absorption analysis: https://goldbook.iupac.org//terms/view/08766
- absorption edge: https://goldbook.iupac.org//terms/view/08767
- near edge X-ray absorption fine structure: https://goldbook.iupac.org//terms/view/08738

Source
- PAC, 2021, 93, 69. 'Vocabulary of radioanalytical methods (IUPAC Recommendations 2020)' on page 106 (https://doi.org/10.1515/pac-2019-0302)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/08768/html
- json: https://goldbook.iupac.org/terms/view/08768/json
- xml: https://goldbook.iupac.org/terms/view/08768/xml

Citation: Citation: 'X-ray absorption near edge structure' 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.08768
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Accessed: 2026-05-18T03:38:16+00:00