title: Germanium adsorption on Ag(111): an AES-LEED and STM study.
abstract: The adsorption of germanium on Ag(111) has been investigated using Scanning Tunneling Microscopy, Auger Electron Spectroscopy and Low Energy Electron Diffraction. From the shape of the Auger peak-to-peak versus time curves, we deduce that at room temperature the growth mode is nearly layer-by-layer at least for the first two layers. In the sub-monolayer range, the growth starts by the formation of a (mean square root of 3 x mean square root of 3)R30 degrees surface superstructure which is complete at 1/3 monolayer coverage. Beyond this coverage a rectangular c(mean square root of 3 x 7) superstructure is observed. STM images reveal that this last reconstruction is formed by an ordered arrangement of self-assembled Ge tetramers giving rise to a surprising undulation of the surface.
authors.affiliation: CRMN, Centre National de la Recherche Scientifique, Campus de Luminy, Case 913, 13288 Marseille Cedex 09, France.
authors.forename: H
authors.initials: H
authors.lastname: Oughaddou
authors.forename: A
authors.initials: A
authors.lastname: Mayne
authors.forename: B
authors.initials: B
authors.lastname: Aufray
authors.forename: J P
authors.initials: JP
authors.lastname: Bibérian
authors.forename: G
authors.initials: G
authors.lastname: Le Lay
authors.forename: B
authors.initials: B
authors.lastname: Ealet
authors.forename: G
authors.initials: G
authors.lastname: Dujardin
authors.forename: A
authors.initials: A
authors.lastname: Kara
mesh_terms: D000327:Adsorption; D000497:Alloys; D004563:Electrochemistry / Q000379:methods; D005857:Germanium / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D016252:Microscopy, Scanning Tunneling / Q000379:methods*; D008968:Molecular Conformation; D053758:Nanoparticles; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D011868:Radioisotopes / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D000497:Alloys; D011868:Radioisotopes; D005857:Germanium; D012834:Silver