Electronic structure of Au and Ag overlayers on Ru(001): The behavior of the noble-metal {ital d} bands
- Department of Chemistry, The University of Western Ontario, London, Ontario, N6A5B7 (Canada)
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
The metal {ital d} bands of Au and Ag individually adsorbed on Ru(001) have been observed with photoemission as have the core 4{ital f} levels of Au. The adlayer {ital d} bands display shifts in their centroids as well as band narrowing due to having fewer noble-metal nearest neighbors relative to bulk metals. The narrowing may be monitored by measuring the doublet nature of these valence-band densities of states or by sampling the overall {ital d}-band width with the former not susceptible to instrumental broadening problems. These widths receive contributions from spin-orbit splitting {Delta}{sub s.o.} and intrinsic {ital d}-band effects {Delta}{sub band}. These have been separated and the inferred {Delta}{sub band} for a Au monolayer suggests that the substrate is contributing measurably to the Au bandwidth while having little or no effect on Ag. Providing that the Au adlayer 4{ital f}-level shifts are measured with respect to the surface of Au rather than the bulk, a consistent picture of {ital d}-band and core-level chemical shifts emerges that, granted the lower number of unlike nearest-neighbor atoms, is compatible with what has been previously observed for bulk noble-metal alloys.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 46351
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 51, Issue 15; Other Information: PBD: 15 Apr 1995
- Country of Publication:
- United States
- Language:
- English
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