Growth of Au on Ag(110): electronic structure by photoemission

Au films, from the submonolayer range up to eight monolayers. have been dep osited in situ at 300 K. The electronic structure has been probed by ultra- violet valence-band photoemission. The discussion of our findings is based on a detailed knowledge of the geometrical structure of each film. With inc reasing Au coverage the valence-band structure changes from Ag- to Au-bulk- like. At intermediate Au coverages an intel face state is observed. It appe ars to be localized between the first and second surface layer of areas whe re Au and Ag atoms are inverted. Moreover, the sp-type surface state observ ed for emission along (Y) over bar in the case of the clean Ag(110) surface is strongly influenced by these inverted Au/Ag areas in that it shifts to higher binding energies. For higher Au coverages this surface state gradual ly fades out. (C) 1999 Elsevier Science B.V. All rights reserved.