Extended x-ray absorption fine structure (EXAFS)
Penner-Hahn, James E. Department of Chemistry, University of Michigan, Ann Arbor, Michigan.
- Form of oscillations
- Fourier transform
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The structured absorption on the high-energy side of an x-ray absorption edge. The absorption edges for an element are abrupt increases in x-ray absorption that occur when the energy of the incident x-ray matches the binding energy of a core electron (typically a 1s or a 2p electron). For x-ray energies above the edge energy, a core electron is ejected from the atom. The ejected core electron can be thought of as a spherical wave propagating outward from the absorbing atom. The photoelectron wavelength is determined by its kinetic energy, which is in turn determined by the difference between the incident x-ray energy and the core-electron binding energy. As the x-ray energy increases, the kinetic energy of the photoelectron increases, and thus its wavelength decreases. See also: Absorption of electromagnetic radiation; Light; Photoemission; Quantum mechanics
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