title: Control of the charge state of metal atoms on thin MgO films.
abstract: The arrangement of single gold and palladium atoms deposited on the surface of a 3 monolayer thin film of MgO was investigated using low-temperature scanning tunneling microscopy. While Pd atoms are arranged in a random fashion, Au forms an ordered array on the surface. The long-range ordering as well as the scanning tunneling microscopy appearance of single Au atoms on a 3 monolayer thin MgO film can be explained by partial charge transfer from the substrate to Au atoms as predicted recently by density functional theory calculations [Phys. Rev. Lett. 94, 226104 (2005)10.1103/PhysRevLett.94.226104]. In contrast with that, Au atoms on a thick film were found to be essentially neutral.
authors.affiliation: Department of Chemical Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Sterrer
authors.forename: Thomas
authors.initials: T
authors.lastname: Risse
authors.forename: Umberto
authors.initials: U
authors.lastname: Martinez Pozzoni
authors.forename: Livia
authors.initials: L
authors.lastname: Giordano
authors.forename: Markus
authors.initials: M
authors.lastname: Heyde
authors.forename: Hans-Peter
authors.initials: HP
authors.lastname: Rust
authors.forename: Gianfranco
authors.initials: G
authors.lastname: Pacchioni
authors.forename: Hans-Joachim
authors.initials: HJ
authors.lastname: Freund