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 42.78: Poster

Mittwoch, 25. März 2009, 17:45–20:30, P2

Surface phases and structure determination of thin silver films grown on the Re(1010) surface — •Viktor Scherf, Lyria Messahel, Christian Pauls, and Klaus Christmann — Institut für Chemie und Biochemie der FU Berlin, Takustr.3, D-14195 Berlin

We have examined the growth of silver films on the Re(1010) surface under UHV conditions by means of electron diffraction techniques (MEED and LEED), and carried out a quantitative structure determination of the (1×1)-Ag phase by LEED. In the submonolayer range, the following LEED phases were observed with increasing silver coverage: c(2×2), p(1×4), p(1×5) and p(1×1), their I,V curves will be presented here. The in situ measured MEED curves of the (0,0) beam at 700 K show with increasing Ag coverage permanently two local maxima and minima; both maxima correlate with the formation of c(2×2) structure at different surface coverages. Once the p(1×1) phase is formed, the MEED intensity decreases almost linearly with the deposited amount of Ag indicating the formation of rough silver multilayers which grow according to a Stranski-Krastanov mechanism. We will also present the first dynamic LEED calculation for the Ag p(1×1) structure which clearly suggests the formation of a silver bilayer. The results will be discussed and compared with previous work on the same system as well as on the Au/Re(1010) system [1].
[1] C. Pauls and K. Christmann, J. Physics Condensed matter, submitted