Resonant photoemission versus incoherent superposition of Auger and photoemission signals

摘要

The angle-resolved resonant photoelectron spectra of Ni and Ce metals are reported. On M_Ⅲ resonance, the intensity of the 6-eV satellite of Ni is found to be independent of the angle of emission relative to the E-vector of the exciting light, while the valence-band photoemission (PE) intensity follows a cos~2 behavior as expected for PE. In contrast to Ni, the enhanced Ce4f PE signal on N_(Ⅳ,Ⅴ) resonance also varies according to cos~2. This shows that the resonant enhancement of the 6-eV Ni satellite is mainly due to a secondary Auger decay, whereas in case of the Ce4f signal it reflects resonant photoemission.