1. School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Department of Chemistry, Applied Physical Chemistry, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
2. European Commission, Joint Research Centre, Postfach 2340, DE-76215 Karlsruhe, Germany
3. Institute of Physics, ASCR, Prague, Czech Republic
4. Faculty of Mathematics and Physics, Charles University, 12116 Prague, Czech Republic