Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 8: Surface State Spectroscopy I

O 8.5: Talk

Monday, March 7, 2016, 11:45–12:00, H4

The Adsorption Structure of Cobalt Tetraphenylporphyrin on Ag(100) — •Daniel Wechsler, Quratulain Tariq, Matthias Franke, Liang Zhang, Hans-Peter Steinrück, and Ole Lytken — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, 91058 Erlangen, Egerlandstraße 3, Germany

Knowledge about the adsorption structure of large organic molecules on single-crystal surfaces is crucial to control how molecules self-assemble on surfaces. We have studied the adsorption structure of cobalt(II) 5,10,15,20-tetraphenylporphyrin (CoTPP) deposited on Ag(100) with low energy electron diffraction (LEED), synchrotron-radiation photoelectron spectroscopy (SRPES), X-ray standing wave (XSW) and near edge X-ray absorption fine structure (NEXAFS). Differences in the LEED patterns show a coverage-dependent unit cell change. From SRPES, XSW and NEXAFS, we were able to determine the atomic height with respect to the surface, the rotational angle of the phenyl rings, and the distortion of the macrocycle. The project is supported by the DFG through FOR 1878 (funCOS).