SUBLIFETIME-RESOLUTION AG L-3-EDGE XANES STUDIES OF AG-AU ALLOYS

High-resolution Ag L-3-edge XANES for a series of Au-Ag alloys, AuAg3, AuAg, and Au3Ag, have been obtained by monitoring the intensity of th e highly energy-resolved Ag L3M4,5M4,5((1)G(4)) Auger line.:The experi mental results reveal features that were previously unresolved with to tal electron yield techniques and confirm previous observations that A g gains d charge and Au loses d in Au-Ag alloys. Full-scale multiple s cattering calculations for the Ag L-3-edge XANES of Ag and AuAg yield semiquantitative agreement with the experiment. The results show that in the case of wide band metals, the Auger yield of a well-separated n arrow final state can indeed be used to improve the resolution of XANE S pear the threshold. The implication of the results to electron charg e redistribution upon alloying is discussed.