1. Department
of Chemical Physics, Lund University, P.O. Box 124, 22100 Lund, Sweden
2. Institut
für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
3. Biology
Centre CAS, Branišovská 31, and Faculty of Science, University of South Bohemia, Branišovská 1760, 370 05 České Budějovice, Czech Republic