Unoccupied states and charge transfer in Cu-Pd alloys studied by bremsstrahlung isochromat spectroscopy, x-ray photoelectron spectroscopy, andLIIIabsorption spectroscopy

Abstract

We have observed the unoccupied partial Pd 4d density of states in Cu-Pd alloys by bremsstrahlung isochromat spectroscopy (BIS). It shows the filling of the Pd 4d band upon alloying, which is consistent with the Pd ${\mathit{L}}_{\mathrm{III}}$ absorption spectroscopy measurements. We have also determined the total charge transfer between Pd and Cu atoms from the binding-energy shifts in the core-level x-ray photoelectron spectroscopy and the intensity of unoccupied Pd d states in the BIS spectra. This is compared with the result from the Pd ${\mathit{L}}_{\mathrm{III}}$ absorption spectroscopy.