EXAFS and Near Edge Structure IV
J. Phys. Colloques 47 (1986) C8-83-C8-87
DOI: 10.1051/jphyscol:1986814
ON THE NATURE OF NONSTRUCTURAL LOW-R PEAK IN FOURIER TRANSFORMS OF SOME EXAFS-SPECTRA
A.G. KOCHUR, A.M. NADOLINSKY et V.F. DEMEKHINRostov Railway Ingineers Institute, Chair of Physics, 344017 Rostov-on-Don, U.S.S.R.
Abstract
K-absorption spectra of kripton and zirconium are calculated considering additional monopole excitations of 3d-shell. It is shown that the disturbance of smoothness of the atomic photoionization cross section due to multi-electron excitations including 3d-shells lead to the appearance of low frequency EXAFS-oscillations that do not correspond to the structure of atomic encirclement of the absorber. Such an effect can make data analyses difficult for the spectra with weak structural signal.