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 44.20: Poster

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

Inelastic electron tunnelling spectroscopy of the ordered PTCDA/Ag(111) interface — •R. Temirov and F.S. Tautz — International University Bremen, Bremen, Germany (Jacobs University Bremen as of spring 2007)

Understanding complex adsorption phenomena is an issue of rising importance. Recently it has been shown that the STM-based Inelastic Electron Tunnelling Spectroscopy (IETS) is a powerful technique for the analysis of adsorption on a single molecular level. Nevertheless the interpretation of the IETS data was shown in general to be far from straightforward. In this contribution we use the well studied case of PTCDA/Ag(111) adsorption as a model system to which the IETS is applied. The results of IETS are compared with HREELS data and theoretically calculated spectra of a free molecule. On the basis of a simple symmetry analysis two vibrational modes are identified. Remarkably, slight variations of the adsorption conditions are found to enhance IETS signal by an order of magnitude. The origin of this enhancement is discussed.