title: Identification of Au-S complexes on Au(100).
abstract: Using a combination of scanning tunneling microscopy and density functional theory (DFT) calculations, we have identified a set of related Au-S complexes that form on Au(100), when sulfur adsorbs and lifts the hexagonal surface reconstruction. The predominant complex is diamond-shaped with stoichiometry Au4S5. All of the complexes can be regarded as combinations of S-Au-S subunits. The complexes exist within, or at the edges of, p(2 × 2) sulfur islands that cover the unreconstructed Au regions, and are observed throughout the range of S coverage examined in this study, 0.009 to 0.12 monolayers. A qualitative model is developed which incorporates competitive formation of complexes, Au rafts, and p(2 × 2) sulfur islands, as Au atoms are released by the surface structure transformation.
authors.affiliation: Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA. pthiel@iastate.edu.
authors.forename: Holly
authors.initials: H
authors.lastname: Walen
authors.affiliation: Ames Laboratory of the USDOE, Ames, Iowa 50011, USA.
authors.forename: Da-Jiang
authors.initials: DJ
authors.lastname: Liu
authors.affiliation: Surface and Interface Science Laboratory, RIKEN, Wako, Saitama 351-0198, Japan.
authors.forename: Junepyo
authors.initials: J
authors.lastname: Oh
authors.affiliation: Surface and Interface Science Laboratory, RIKEN, Wako, Saitama 351-0198, Japan.
authors.forename: Hyun Jin
authors.initials: HJ
authors.lastname: Yang
authors.affiliation: Surface and Interface Science Laboratory, RIKEN, Wako, Saitama 351-0198, Japan.
authors.forename: Yousoo
authors.initials: Y
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA. pthiel@iastate.edu and Ames Laboratory of the USDOE, Ames, Iowa 50011, USA and Department of Materials Science & Engineering, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: P A
authors.initials: PA
authors.lastname: Thiel