Regensburg 2007 – scientific programme

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O: Fachverband Oberflächenphysik

O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)

O 44.26: Poster

Wednesday, March 28, 2007, 17:00–19:30, Poster C

Molecular distortion upon adsorption: The case of NTCDA/ Ag(111) — •Christian Kumpf, Christoph Stadler, Ingo Kröger, Michael Scheuermann, and Eberhard Umbach — Univ. Würzburg, Experimentelle Physik II, Am Hubland, 97074 Würzburg

The properties of many functional materials and electronic devices based on (multi-)layer systems and thin films are dominantly defined by their surfaces and interfaces. This is particularly true for organic thin films and adsorbate systems, the properties of which largely depend on their interaction with the underlying substrate. Therefore a detailed investigation of this interaction is extremely important in order to obtain a comprehensive understanding of these materials.

I this contribution recent results for one of the most important model systems for molecular adsorption on surfaces is presented: 1,4,5,8-naphthalene-tetracarboxylicacid-dianhydride (NTCDA) on Ag(111). Using the techniques x-ray standing waves (XSW) and quantitative low energy electron diffraction (LEED-IV) a significant bending of the molecules was found upon adsorption. The results demonstrate the chemisorptive character of the adsorption.

Furthermore, a novel method for the interpretation of PES- and Auger-based XSW data is presented. The correction of non-dipolar effects in photoemission as well as electron-induced effects in Auger-electron emission was lively discussed within the last years. Using the example NTCDA/Ag(111) we demonstrate how the results from these different detection channels can be reconciled in a self-consistent iterative correction-method.