Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 45: Organic-Inorganic Hybrid Systems and Organic Films

O 45.26: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1A

Investigating the orientation of halogenated benzene molecules on Cu(111) surfaces using IR spectroscopy — •Christina Pentzek and Karina Morgenstern — Ruhr-Universität Bochum, Chair of Physical Chemistry I, Germany

Adsorption of organic molecules on metal surfaces is important to understand the mechanisms in heterogeneous catalysis. In this study, vibrational spectra of chlorobenzene and bromobenzene molecules adsorbed on a Cu(111) surface are investigated by reflection-absorption infrared spectroscopy (RAIRS). While it is well established that unsubstituted benzene molecules adsorb with their molecular plane in parallel to the surface, it is not known how halogen molecules influence the adsorption orientation. Because of the selection rules of RAIRS we are able to identify the orientation of halogenated benzene molecules on Cu(111) surfaces. However, the vibration modes depend on the layer thickness of molecules at the surface. In this presentation we want to discuss different orientations of halogenated benzenes at different coverages at low temperatures.