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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Phase Shifts in Rare-Earth Compounds
Abstract EXAFS spectroscopy has been used to probe the short-range interatomic correlations in a wide variety of materials. These include catalytic systems, chemical complexes and large molecules of biological interest as well as materials of interest to physicists. EXAFS spectroscopy involves measuring the cross-section for X-ray absorption for a range of X-ray photon energies (30–1000 eV) above the onset of absorption edge position. The wave function of the resulting photoelectron consists of an outgoing wave together with small amplitude waves scattered back from the near-neighbour atoms. The interference between these waves causes oscillations in the absorption C.S. leading to maxima and minima in EXAFS1. The interference pattern is determined by the phase difference between the waves which depends on photon energy and the distance travelled. The phase function also depends on the identity of central atom as well as the back scattering atoms. Thus an EXAFS measurement can reveal the number and identity of the neighbouring atoms as well as their distribution.
Phase Shifts in Rare-Earth Compounds
Abstract EXAFS spectroscopy has been used to probe the short-range interatomic correlations in a wide variety of materials. These include catalytic systems, chemical complexes and large molecules of biological interest as well as materials of interest to physicists. EXAFS spectroscopy involves measuring the cross-section for X-ray absorption for a range of X-ray photon energies (30–1000 eV) above the onset of absorption edge position. The wave function of the resulting photoelectron consists of an outgoing wave together with small amplitude waves scattered back from the near-neighbour atoms. The interference between these waves causes oscillations in the absorption C.S. leading to maxima and minima in EXAFS1. The interference pattern is determined by the phase difference between the waves which depends on photon energy and the distance travelled. The phase function also depends on the identity of central atom as well as the back scattering atoms. Thus an EXAFS measurement can reveal the number and identity of the neighbouring atoms as well as their distribution.
Phase Shifts in Rare-Earth Compounds
Ghatikar, M. N. (Autor:in)
01.01.1987
4 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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