Oliver Bauer

Institute for Physical and Theoretical Chemistry, University of Bonn
"Organic Films" work group

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Oliver Bauer

Institut für Physikalische
und Theoretische Chemie
Universität Bonn

Wegelerstr. 12
D-53115 Bonn


Büro:	2.022
Tel.:	+49 (0)2 28 / 73 - 32 92

Labor:	U1.026
Tel.:	+49 (0)2 28 / 73 - 35 99

Fax:	+49 (0)2 28 / 73 - 25 51
e-mail:	bauer@pc.uni-bonn.de

Topic of the Doctoral Thesis: Structure and bonding properties of ultra-thin films of π-conjugated organic molecules on single-crystalline transition metal surfaces

Our research focuses on the chemical bonding of π-conjugated organic molecules on metal surfaces. Within this doctoral thesis ultra-thin ordered layers of prototype organic molecules, e. g., polyacenes or perylene-3,4,9,10-tetracarboxlic acid dianhydride (PTCDA), on well-defined transition metal surfaces are investigated under ultra-high vacuum conditions (UHV). The structures of the adsorbed layers are identified by Low Energy Electron Diffraction (LEED). The adsorption height as well as the adsorption geometry of the organic adsorbate on a given surface are determined by the Normal-Incidence X-ray Standing Waves technique (XSW) – these experiments are done in cooperation with the group of Professor F.S. Tautz, FZ Jülich, at the ESRF, Grenoble (France). This allows to gain insight into the bonding mechanism of the molecules on the surface. In addition, the electronic properties are investigated by spectroscopic methods such as X-ray and Ultraviolet Photoelectron Spectroscopy (XPS and UPS, respectively; in cooperation).

This work is embedded in the DFG-Sonderforschungsbereich 624 “Chemische Template“ and is supported by the DFG through Sachbeihilfe SO 407/6-1 “Vertical Bonding Geometry of Pi conjugated Molecules on Surfaces“ and by the European Synchrotron Radiation Facility (ESRF, Grenoble, France).

Publications:

1. S. K. M. Henze, O. Bauer, T.-L. Lee, M. Sokolowski, and F. S. Tautz, Vertical bonding distances of PTCDA on Au(111) and Ag(111): Relation to the bonding type, Surface Science 601 (2007) 1566-1573.

2. J. Ikonomov, O. Bauer, and M. Sokolowski, Highly ordered thin films of perylene-3,4,9,10-tetracarboxylic acid dianhydride (PTCDA) on Ag(100), Surface Science 602 (2008) 2061-2068.

3. E. Le Moal, M. Müller, O. Bauer, and M. Sokolowski, Misfit driven azimuthal orientation of NaCl domains on Ag(100), Surface Science 603 (2009) 2434.

4. A. Hauschild, R. Temirov, S. Soubatch, O. Bauer, A. Schöll, B. C. C. Cowie, T.-L. Lee, F. S. Tautz, and M. Sokolowski, Normal-incidence x-ray standing-wave determination of the adsorption geometry of PTCDA on Ag(111): Comparison of the ordered room-temperature and disordered low-temperature phases, Phys. Rev. B 81 (2010) 125432.

5. E. Le Moal, M. Müller, O. Bauer, and M. Sokolowski, Stable and metastable phases of PTCDA on epitaxial NaCl films on Ag(100), Physical Review B 82 (2010) 045301.

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