Measurement principle of
X-ray analysis in which the absorption spectrum is used to measure the number of atoms, species, and other parameters of chemical elements.
Notes: - XAS measures changes in the linear absorption coefficient of an element in a sample as a function of incident photon energy.
- XAS requires a highly monochromatic (with \(\Delta E/E \approx 10^{-4}\) to \(\pu{E-5}\)), high flux X-ray beam.
See also: X-ray absorption near edge structure
Source:
PAC, 2021, 93, 69. 'Vocabulary of radioanalytical methods (IUPAC Recommendations 2020)' on page 105 (https://doi.org/10.1515/pac-2019-0302)