AUGER-PHOTOELECTRON-COINCIDENCE SPECTRA OF NI IN PURE AND ALLOY SYSTEMS

Auger-photoelectron-coincidence spectroscopy has been used to study th e effect of alloying on the Ni L(23), VV Anger spectrum in the Ni/Fe s ystem. Data have been collected for the Ni L(23) VV Auger line in coin cidence with the 2p(3/2) and 2p(1/2) photoelectron line from single-cr ystal Ni and a Ni50%Fe50% alloy. Alloying is shown to affect the valen ce band and this in turn alters the components of the Auger line shape in coincidence while the overall singles lines may appear similar. A narrowing of the valence band and its shifting away from the Fermi lev el is seen to affect the bandlike contribution to the spectrum, the Co ster-Kronig rate, and the intrinsic initial- and final-state shake-up and/or shake-off processes.