J. Phys. Colloques
Volume 47, Numéro C8, Décembre 1986EXAFS and Near Edge Structure IV
|Page(s)||C8-83 - C8-87|
J. Phys. Colloques 47 (1986) C8-83-C8-87
ON THE NATURE OF NONSTRUCTURAL LOW-R PEAK IN FOURIER TRANSFORMS OF SOME EXAFS-SPECTRAA.G. KOCHUR, A.M. NADOLINSKY et V.F. DEMEKHIN
Rostov Railway Ingineers Institute, Chair of Physics, 344017 Rostov-on-Don, U.S.S.R.
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.