Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)
O 18.27: Poster
Monday, February 25, 2008, 18:30–19:30, Poster F
Investigation of the interface between aromatic thiolate SAMs and the Au(111) surface — •Daniel Weier1, Axel Beimborn1, Christian Flüchter1,2, Frank Schönbohm1, Ulf Berges1,2, Sven Döring1,2, Tobias Lühr1 und Carsten Westphal1,2 — 1Fakultät Physik - Universität Dortmund, Otto-Hahn-Str.4, D 44221 Dortmund, Germany — 2DELTA - Fakultät Physik - Universität Dortmund, Maria-Goeppert-Mayer-Str. 2, D 44227 Dortmund, Germany
SAMs (Self-assembled-monolayers) of aromatic thiolates have been intensively studied in the last three decades. The amphiphilic molecules with a chainlike structure consist of a hydrophobic head group and a hydrophilic carbon chain part. The structure of the molecules allows molecular chemisorption in close packed arrays onto well prepared surfaces due to the high affinity of the sulphur head group to the Au surface. An important trait of the molecules is their strong interaction with x-ray radiation and electrons. The problem of radiation damage within the focus of an undulator beamline is well known. In this project the photon flux density was reduced by moving the sample behind the focus. The out-of-focus measurements showed a significant reduction in the radiation damage at the adsorbed molecules and long data acquisition times became possible. We present first full angle photoelectron diffraction data of the sulphur 2p peak of SAM thiolates on Au(111). The diffracted S 2p signal clearly displays intensity variations. We compare the experimental data with the results of a first simulation of a structure model of the thiolate/Au(111) interface.