Comparison Of Experimental And Theoretical Calculations Of Backscattering Amplitude And Phase Shift Functions For A Number Of FCC Metals

G. S. Knapp; A. G. McKale; S.K. Chan; B. W. Veal

doi:10.1117/12.936591

12 August 1986 Comparison Of Experimental And Theoretical Calculations Of Backscattering Amplitude And Phase Shift Functions For A Number Of FCC Metals

G. S. Knapp, A. G. McKale, S.K. Chan, B. W. Veal

Author Affiliations +

Proceedings Volume 0690, X-Rays in Materials Analysis: Novel Applications and Recent Developments; (1986) https://doi.org/10.1117/12.936591
Event: 30th Annual Technical Symposium, 1986, San Diego, United States

Abstract

Extended x-ray absorption fine structure (EXAFS) spectra have been acquired experimen-tally for a number of fcc metals with atomic number Z between 28 (Ni) and 90 (Th). The backscattering amplitude and phase shift functions have been extracted from the data and compared with calculations based on a single scattering theory, using for the ejected electron, the exact curved wave function. The calculated functions obtained with the curved wave formalism provide increased accuracy, particularly at low k, i.e. k < 4 Å-1, compared to those obtained with the plane wave approximation. Agreement between the calculated and measured backscattering and phase functions is excellent for Ni, Cu, and Yb, but less satisfactory for the heavier elements, Pt, Au, Pb, and Th. Experiment confirms the prediction that very rapid changes of the the phase occur as a function of k for high Z elements.

Citation Download Citation

G. S. Knapp, A. G. McKale, S.K. Chan, and B. W. Veal "Comparison Of Experimental And Theoretical Calculations Of Backscattering Amplitude And Phase Shift Functions For A Number Of FCC Metals", Proc. SPIE 0690, X-Rays in Materials Analysis: Novel Applications and Recent Developments, (12 August 1986); https://doi.org/10.1117/12.936591

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