Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.51: Poster

Dienstag, 15. März 2011, 18:30–22:00, P4

Surface Phases and Structure Determination of Thin Gold Films Grown on a Re(1010) Surface — •Lyria Messahel, Christian Pauls, and Klaus Christmann — Institut für Chemie und Biochemie, FU-Berlin

Gold atoms deposited onto a clean Re(1010) surface form, as a function of surface concentration, various submonolayer phases leading to (1× n) LEED structures (n=3,4,5,6), the final one being a (1× 1) phase associated with a pseudomorphic Au bilayer and a coverage of two monolayers (Θ =2) [1].

The first well-ordered Au overlayer structure is a (1× 3) phase [1]. If we relate its coverage to the surface concentration of the full bilayer (Θ =2) we end up with a coverage Θ _{1× 3}=4/3. LEED calculations have been performed for various Au surface geometries based on this coverage. However, a plausible ball model suggests an additional Au atom in the (1×3) unit cell, and a LEED I,V calculation has also been carried out for Θ _{1× 3}=5/3. We will present the calculated I,V curves for both coverages and compare their structural parameters (geometrical displacements and thermal vibration amplitudes). An additional analysis of the Au(1× 4) phase’s experimental data will also be presented as a support to the assumption Θ _{1× 3}=5/3.

[1] C. Pauls and K. Christmann, J. Physics: Condens. Matter 21 (2009) 134012