Final state effects in the photoemission core level and Auger spectra of Ni and Ni alloyed with Zn

The L 3 M 45 M 45 Auger spectrum and the 2p 3/2 core level spectrum of pure Ni are found to be considerably wider than those of pure Cu. When Ni is diluted into Zn, the main peaks in the L 3 M 45 M 45 Auger spectrum and the 2p 3/2 core level spectrum become as sharp as those of pure Cu. High resolution UV photoemission experiments show that the Ni d-like density of states narrows and retreats from the Fermi level upon dilution of Ni in Zn. These results suggest that final state interactions, which broaden the core level spectra, are also broadening the Auger spectra. It is also found that the L 3 M 23 M 45 Auger spectrum of Ni does not narrow when Ni is diluted into Zn, indicating that it does not represent the density of d-like states.