Resonant photoemission processes at the 3dedge inUO2(111)

Photoemission intensity of the 4f levels is enhanced at the resonant excitation energies of the 3$d_{3/2}$ (3728 eV) and 3$d_{5/2}$ (3554 eV) deep core levels. Also, an intense Auger-like feature appears near the 4$d_{3/2}$ photoemission peak. Transition-rate calculations agree semiquantitatively with observed relative intensity enhancements of the spin-orbit-split components of both subshells as well as with the multiplets of the $M_4$ $N_6$,7${\mathrm{N}}_6$,7 and $M_5$ $N_6$,7${\mathrm{N}}_6$,7 Auger spectra. The latter show dispersion and narrowing near resonance. The shakeup satellites associated with 4f photoemission show insignificant intensity change at resonance showing these final states to be inaccessible via autoionization.