title: The evolution of the electronic structure at the Bi/Ag(111) interface studied using photoemission spectroscopy.
abstract: The growth of Bi on Ag(111) induces different surface structures, including (√3 × √3)R30° surface alloy, Bi-(p × √3) overlayer and Bi(110) thin film, as a function of increasing Bi coverage. Here we report the study of electronic states of these structures using core level and valence band photoemission spectroscopy at room temperature. The sp-derived Shockley surface state on Ag(111) is rapidly quenched upon deposition of Bi, due to the strong variation of the in-plane surface potential in the Ag(2)Bi surface alloy. The Bi 4f core levels of the (√3 × √3)R30° alloy and Bi(110) thin film are shifted to lower binding energy by ~0.6 eV and ~0.3 eV compared with the Bi bulk value, respectively. Mechanisms inducing the core level shifts are discussed as due to a complex superposition of several factors. As Bi coverage increases and a Bi(110) overlayer forms on Ag(111), a new state is observed at ~0.9 ML arising from electronic states localized at the Ag-Bi interface. Finally the change of work function as a function of coverage is discussed on the basis of a charge transfer model.
authors.affiliation: Department of Chemistry, Chemistry Research Laboratory, Mansfield Road, Oxford, UK. Hongliang.Zhang@pnnl.gov
authors.forename: K H L
authors.initials: KH
authors.lastname: Zhang
authors.forename: I M
authors.initials: IM
authors.lastname: McLeod
authors.forename: M
authors.initials: M
authors.lastname: Lahti
authors.forename: K
authors.initials: K
authors.lastname: Pussi
authors.forename: V R
authors.initials: VR
authors.lastname: Dhanak
mesh_terms: D000497:Alloys; D001729:Bismuth / Q000737:chemistry*; D004581:Electronics; D004583:Electrons; D008422:Materials Testing; D056951:Photoelectron Spectroscopy / Q000379:methods*; D010825:Physics / Q000379:methods; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000497:Alloys; D012834:Silver; D001729:Bismuth