1. Department
of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014, Helsinki, Finland
2. Department
of Physics, University of Helsinki P.O. Box 64, FIN-00014, Helsinki, Finland
3. Division
of Nuclear Physics, Lund University, P.O Box 118, SE-22100, Lund, Sweden
4. Fachbereich
Chemie, Philipps Universität Marburg, Hans-Meerwein-Straße 4, D-35032 Marburg, Germany
5. Department
of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3890, United States