Chemistry, Physics and Astronomy, Materials Science and Engineering, Ames Laboratory
Journal or Book Title
Journal of Chemical Physics
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.
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American Institute of Physics
Walen, Holly L.; Liu, Da-Jiang; Oh, Junepyo; Lim, Hyunseob; Evans, James W.; Kim, Yousoo; and Thiel, Patricia A., "Self-organization of S adatoms on Au(111): √3R30° rows at low coverage" (2015). Chemistry Publications. 101.