1. Physik-Department T38; Technische Universität München; James-Franck-Strasse D-85748 Garching Germany
2. Institute of Organic Chemistry and Biochemistry; Academy of Sciences of the Czech Republic; Flemingovo namesti 2 166 10 Prague Czech Republic
3. Department of Physical and Macromolecular Chemistry, Faculty of Science; Charles University Prague; Albertov 6 128 43 Prague Czech Republic