X-ray photoelectron spectroscopy study of U(Rh1-xPdx)(3) alloys

The XPS valence-band and core-level spectra of pseudo-binary U(Rh1-xPdx)(3) alloys for x = 0, 0.83, 0.93, 0.97, and 1.0 were measured to investigate t he systematics of their core-level spectra. We could consistently understan d their U 4f core-level spectra by assuming three final-state configuration s, like the core-level spectra of mixed-valence Ce-based compounds. These f inal states are ascribed to predominance of 5f(2)-, 5f(3)-, and 5f(4)-confi gurations, which are caused by the mixed valence with 5J(2)(U4+) and 5f(3)( U3+) character in the initial state. The results indicate the possibility o f determining the valence states of other uranium compounds from the analys is of their core-level spectra.