1. Mulliken
Center for Theoretical Chemistry, University of Bonn, Beringstr. 4
+ 6, D-53115 Bonn, Germany
2. Universität
zu Köln, Greinstrasse 4, D-50939 Köln, Germany
3. Institute
of Physics, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
4. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
5. Institute
of Organic Chemistry, Johannes Gutenberg University Mainz, Duesbergweg
10-14, 55128 Mainz, Germany