Regensburg 2007 – scientific programme

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O: Fachverband Oberflächenphysik

O 26: Organic, Polymeric, and Biomolecular Films II

O 26.1: Talk

Tuesday, March 27, 2007, 11:15–11:30, H42

High-resolution ARUPS study of thin NTCDA films on Ag(111) — •Simon Hame, Johannes Ziroff, Azzedine Bendounan, and Friedrich Reinert — University of Würzburg, Experimental Physics II, 97074 Würzburg, Germany

We present high-resolution photoemission data of the valence band structure of organic thin films on noble metal surfaces, in particular on the epitaxial system of a 1,4,5,8-naphtalene-tetracarboxylic acid dianhydide (NTCDA) monolayer on a Ag(111) surface in the relaxed configuration. The electronic structure close to the Fermi edge shows two features: the HOMO peak and a peak assigned to the former LUMO which is partially filled because of charge transfer from the substrate. There appears an additional sharp feature with a pronounced temperature dependence right at the Fermi energy. In high-resolution ARUPS the backfolding of Ag 5s states can be seen as well. We also present data of the order-disorder transition upon cooling beneath 155 K and discuss the relation of quasi-2D and localized molecular properties.