Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 28: Organic-Inorganic Systems I: PTCDA
O 28.7: Vortrag
Dienstag, 8. März 2016, 12:15–12:30, S054
Determination of the adsorption geometry of the PTCDA on the Cu(110) surface by NIXSW triangulation — •Simon Weiß1,2, Ina Krieger3, Timo Heepenstrick3, Serguei Soubatch1,2, and F. Stefan Tautz1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Jülich Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Jülich, Germany — 3Institut für Physikalische und Theoretische Chemie, Universität Bonn, 53115 Bonn, Germany
The normal incidence x-ray standing wave (NIXSW) technique is frequently used to determine the adsorption height of atoms or molecules adsorbed on surfaces. Moreover it is possible to identify the adsorption site as well using several Bragg reflections and the triangulation approach.
We applied this method to a ordered layer of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) on the Cu(100) surface. This molecular phase contains two differently orientated PTCDA molecules, equivalent from structure point of view, which are found to be located at bridge sites. Compared to PTCDA adsorbed on the low index Ag surfaces, the bending of the PTCDA molecule on Cu(100) is different. The carboxylic oxygens are no longer located below the perylene backbone. Nevertheless the tendency that the oxygen atoms adsorb close to on top positions relative to the surface atoms is conserved.