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 18.31: Poster
Monday, February 25, 2008, 18:30–19:30, Poster F
The adsorption of PTCDA on coin metal surfaces: a correlation between the adsorption height and the chemisorptive nature of the adsorbate-substrate bonding — •Oliver Bauer1, Annegret Hauschild1, Serguei Soubatch2, Stina K. M. Henze3, Ruslan Temirov3, Adam Lassise3, Frank Stefan Tautz2, and Moritz Sokolowski1 — 1Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstr. 12, 53115 Bonn — 2Institut für Bio- und Nanosysteme 3 (IBN3), Forschungszentrum Jülich GmbH, 52425 Jülich — 3School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen
The vertical bonding distance of the adsorbate to the underlying surface can be regarded as a quantity of the strength and the chemisorptive character of the bond. The Normal-Incidence X-ray Standing Wave (NIXSW) technique has been used to determine the adsorption heights of perylene-3,4,9,10-tetracarboxylic acid dianhydride (PTCDA) on various single-crystalline coin metal surfaces. In addition we have recently investigated the adsorption heights as well as the adsorption geometry of PTCDA in the submonolayer regime on the Ag(100) and Ag(110) surfaces by NIXSW: We find vertical bonding distances of 2.66(4) Å and 2.59(1) Å respectively. For PTCDA/Ag(100), the carboxylic and anhydride oxygen atoms are located 2.57(7) Å and 2.79(10) Å above the substrate surface respectively. Based on the experimental findings bonding models which include a synergetic effect of adsorbate-substrate bonding and back-bonding are discussed for PTCDA adsorption on coin metal surfaces. Supported by the DFG and the ESRF.