INVESTIGATION OF THE EXTENDED X-RAY ABSORPTION FINE-STRUCTURE (EXAFS) AT L-EDGES OF HEAVY-ELEMENTS

Using the synchrotron radiation of the Deutsches Elektronen-Synchrotron DESY, the extended X-ray absorption fine structure at the L-edges of Au has been investigated. The magnitudes of the Fourier transforms of the LI and the LIII fine structures yield maxima in real space showing a splitting which is the same for both edges. This splitting is attributed to the oscillatory behaviour of the back-scattering amplitude of the photoelectron wave, which is characteristic for heavy scattering atoms. Only transitions to d-symmetric final states contribute significantly to the LII and LIII absorption.