RESONANT PHOTOEMISSION AT THE 2P EDGES OF NI - RESONANT RAMAN AND INTERFERENCE EFFECTS

Unambiguous evidence for resonant photoemission in Ni is presented. In terference effects are identified at the 2p edges for the valence band and the 6 eV satellite. A rapid transition from a resonant Raman to a n Auger-like regime shows that the core-excited states above threshold are not localized enough to significantly enhance the photoemission i ntensity, implying a large fraction of incoherent intensity. The resul ts indicate that the appearance of interference effects does not requi re strong localization of the intermediate state.