1. J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Dolejškova 3, 18223 Prague 8, Czech Republic
2. Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
3. Computational Physics Laboratory, Tampere University, P.O. Box 692, FI-33014 Tampere, Finland
4. Faculty of Biotechnology, University of Wrocław, Joliot-Curie 14A, 50-383 Wrocław, Poland
5. Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, 16610 Prague 6, Czech Republic