Dresden 2014 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 62: Posters: Surface Reactions and Dynamics, Nanostructures

O 62.29: Poster

Mittwoch, 2. April 2014, 17:30–21:00, P1

IV-Analysis of organic adsorbates investigated by MCP-LEED — •Ina Krieger¹, Oliver Bauer¹, Georg Held², and Moritz Sokolowski¹ — ¹Institute for Physical and Theoretical Chemistry, University of Bonn, Wegelerstraße 12, 53115 Bonn, Germany — ²University of Reading, Department of Chemistry, Whiteknights, Reading, RG6 6AD, UK

OVER the last years, the adsorption geometries of some large aromatic molecules on metal surfaces could be determined by the normal incidence wave technique (NIXSW). However, NIXSW is rather elaborate and requires synchrotron radiation. In addition, any substrate reconstruction is difficult to access by NIXSW. Hence we investigate whether LEED-IV analysis, the conventional method for the determination of adsorption sites of adsorbates, is suitable for this purpose.
We have chosen PTCDA on Ag(100) as a test systems, because this adsorption geometry had been determined in detail by NIXSW and DFT before [1]. We find reasonable agreement of experimental and theoretical IV curves and support for the surface buckling predicted by DFT. In addition, we discuss current problems of the experiment and the theoretical evaluation. Supported by the DFG.

References
O. Bauer, G. Mercurio, M. Willenbockel, et al., Physical Review B 86 (2012) 235431.