J. Phys. IV France 7 (1997) C2-353-C2-356
High Resolution Ag L3-XANES Studies of AuAg Alloys Using the Electron Yield of a Narrow Auger ChannelW. Drube1, R. Treusch1, T.K. Sham2, A. Bzowski3 and A.V. Soldatov4
1 HASYLAB at DESY, Notkestr 85, 22603 Hamburg, Germany
2 Department of Chemistry, University of Western Ontario, London N6A 5B7, Canada
3 Department of Chemistry, University of Western Ontario, London N6A 5B7 Canada
4 Rostov State University, Rostov-Don, Russia
The Ag L3-XANES for Ag metal and a series of Au-Ag alloys, AuAg3, AuAg and Au3Ag have been obtained by monitoring the intensity of the Ag L3—M4,5M4,5 Auger electrons with high energy resolution. The selected 1G4 final state has a much longer lifetime than the L3 core hole which results in a reduced lifetime broadening of the partial yield spectra. Subtle features which are predicted by theory and barely visible in total yield spectra are clearly resolved here. The experiment confirms the earlier conventional XANES observation that Ag gains d charge upon alloying with Au. Full-scale multiple scattering calculations have been carried out for the Ag L3-XANES of Ag and AuAg. The results are discussed in the context of electron charge redistribution and unoccupied densities of states.
© EDP Sciences 1997