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Proceedings Paper

Comparison Of Experimental And Theoretical Calculations Of Backscattering Amplitude And Phase Shift Functions For A Number Of FCC Metals
Author(s): G. S. Knapp; A. G. McKale; S.K. Chan; B. W. Veal
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Paper 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.

Paper Details

Date Published: 12 August 1986
PDF: 6 pages
Proc. SPIE 0690, X-Rays in Materials Analysis: Novel Applications and Recent Developments, (12 August 1986); doi: 10.1117/12.936591
Show Author Affiliations
G. S. Knapp, Surface Science Laboratories (United States)
A. G. McKale, Argonne National Laboratory (United States)
S.K. Chan, Argonne National Laboratory (United States)
B. W. Veal, Argonne National Laboratory (United States)

Published in SPIE Proceedings Vol. 0690:
X-Rays in Materials Analysis: Novel Applications and Recent Developments
Thomas W. Rusch, Editor(s)

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