1. University of Bremen Institute for Physical and Theoretical Chemistry Leobener Straße NW2 D-28359 Bremen Germany
2. Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science Utrecht University Universiteitsweg 99 3584 CG Utrecht The Netherlands
3. Present address: Bergische Universität Wuppertal Gaußstraße 20 D-42119 Wuppertal Germany
4. University of Bremen, Theoretical Philosophy Enrique-Schmidt-Straße 7 D-28359 Bremen Germany
5. Bremen Center for Computational Materials Science Am Fallturm 1 D-28359 Bremen Germany
6. MAPEX Center for Materials and Processes Bibliothekstraße 1 D-28359 Bremen Germany