Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)

O 18.21: Poster

Montag, 25. Februar 2008, 18:30–19:30, Poster F

Inelastic Electron Tunnelling Spectroscopy in studies of complex metal-organic interfaces: The case of PTCDA/Ag(111) — •Adam Lassise¹, Ruslan Temirov², and Stefan Tautz² — ¹Jacobs University, Bremen, Germany — ²Forschungszentrum Jülich, Jülich, Germany

Recently it has been proposed that the STM-based Inelastic Electron Tunnelling Spectroscopy (STM-IETS) can solve the long standing problem of the STM chemical insensitivity. However, due to the problems with the interpretation of the IETS data, the potentials of this method in application to the large organic adsorbates are not yet well understood. Here we apply STM-IETS to the well studied model case of complex organic adsorption - PTCDA/Ag(111). We analyse the IETS data obtained on PTCDA molecules in different adsorption states and show that the variations of the local electronic structure of the molecule mostly affect the intensity of IET spectral features but not their energetic positions. Finally, we use the IET imaging in order to identify the strongest vibrational modes observed in IET spectra.