1. Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Universitatsstr.
31, D-93040 Regensburg, Germany
2. School
of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, United Kingdom
3. Chemistry
Department, Murdoch University, Murdoch, W.A. 6150, Australia
4. Department
of Molecular and Optical Physics, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str.
3, 79104 Freiburg, Germany