1. Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany
2. Department of Physics, University of Ioannina, 45110 Ioannina, Greece
3. Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
4. Department of Molecular Physics, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland