INFLUENCE OF MATRIX ELEMENT EFFECTS IN DETERMINING THE DENSITY-OF-STATES FROM PHOTOEMISSION SPECTRA - CU-PD ALLOY

It is found that a change of the photoionization matrix element with t he binding energy in the valence band can cause a substantial discrepa ncy between the density of states and the photoemission spectrum for d -band metals and alloys even in the x-ray photoemission spectroscopy r egime. This is the main cause of the controversial discrepancy between photoemission spectra and theoretical density of states predicted in the Korringa-Kohn-Rostoker coherent-potential approximation for Cu-Pd alloys, rather than the local lattice relaxation around Pd atomic site s.