Fig. 3.
Temperature-programmed XPS measurements of the Pd 3d5/2 signal (measured at 470 eV photon energy) and the Ga 3d and valence band signals (measured at 120 eV). Note that the Ga 3d spectra are shown in inverted order as compared to Pd 3d due to the inverse intensity effects. Spectra have been taken in 25 K steps between 373 and 698 K. 4 MLE Ga were initially deposited. For comparison, the BE of Pd3d in clean Pd foil is reported at ∼335.1 eV, and a high “d-band” induced density of states at the Fermi edge is to be expected.