1. Self-organization of S adatoms on Au(111): √3R30? rows at low coverage.
- Author
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Walen, Holly, Da-Jiang Liu, Junepyo Oh, Hyunseob Lim, Evans, J. W., Yousoo Kim, and Thiel, P. A.
- Subjects
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GOLD compounds , *METAL ions , *ADATOMS , *SCANNING tunneling microscopy , *EFFECT of temperature on metals - Abstract
Using scanning tunneling microscopy, we observe an adlayer structure that is dominated by short rows of S atoms, on unreconstructed regions of a Au(111) surface. This structure forms upon adsorption of low S coverage (less than 0.1 monolayer) on a fully reconstructed clean surface at 300 K, then cooling to 5 K for observation. The rows adopt one of three orientations that are rotated by 30 from the close-packed directions of the Au(111) substrate, and adjacent S atoms in the rows are separated by √ 3 times the surface lattice constant, a. Monte Carlo simulations are performed on lattice-gas models, derived using a limited cluster expansion based on density functional theory energetics. Models which include long-range pairwise interactions (extending to 5a), plus selected trio interactions, successfully reproduce the linear rows of S atoms at reasonable temperatures. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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