Chemical-Shift Effects and Origin of the Pd3dCore-Level Satellite in CuPd Alloys

The palladium $3d_{\frac{3}{2},\frac{5}{2}}$ core-level satellites and valence-band satellite are studied experimentally. The nature of the former can be elucidated by a comparison with the rhodium $3d$ spectrum. A substantial chemical shift is observed for the core-level satellites in Cu-Pd alloys. The final state in the Auger process $M_5\mathrm{VV}$ is found to be quasiatomic and is identified with the valence-band satellite. As a function of copper concentration, the Auger final state and the core-level satellites undergo the same chemical shift.