Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.46: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Coverage-dependence adsorbated structure of tetracene on Ag(110) — •Han Huang1,2, Fei Song1,3, Qiao Chen4, Wuzong Zhou5, and Shing Bao1 — 1Department of Physics, Zhejiang University, Hangzhou 310027, P. R. China — 2Department of Physics, National University of Singapore,117542,Singapore — 3ISA and iNANO, University of Aarhus, 8000C,Denmark — 4Department of chemistry, University of Sussex, Sch Life Sci, Brighton BN1 9QJ, E Sussex England — 5School of Chemistry, University of St Andrews, , St Andrews KY16 9ST, Fife Scotland
The ordered adsorption structures of tetracene on Ag(110) have been studied by low energy electron diffraction (LEED), scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. At a low coverage, as calibrated with LEED, both p(4 x 4) and c(8 x 4) ordered structures are simultaneously formed on an Ag(110) surface at room temperature. STM images suggest the molecular plane is parallel to the Ag surface with its long molecular axis aligned along the [001] azimuth. DFT optimization reveals a separation of 0.3 nm between the molecular plane and substrate surface while the center of the tetracene molecule is on the long bridge site. Increasing coverage slightly, a (6,2;2,5)structure is formed while the adsorbed molecules maintain the flat-lying geometry with adjacent molecules alternating their height relative to the surface.