Partial densities of states of alloys measured with x-ray-photoelectron diffraction:AuCu3(001)

Using a single crystal of ${\mathrm{AuCu}}_3$(001) as a test case, it is shown that x-ray-excited core-level photoelectron-diffraction patterns of an ordered alloy can be employed to decompose the total alloy density of states of the valence band into the partial densities of states of the constituents. The results of this new method are in good agreement with earlier experiments and recent band-structure calculations. The ratios of core-level to valence-band cross sections of each constituent of the alloy are also determined and compared to those of the pure elements. Within experimental error no changes of these cross-section ratios upon alloying are observed.