1. Dynamical Spectroscopy, Department of Chemistry, Technical University of Munich, Lichtenbergstraße 4, 85748 Garching b. Munich, Germany
2. Chemical Physics, Department of Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
3. Institute of Physics, University of Rostock, Albert Einstein Straße 23-24, 18059 Rostock, Germany
4. Institute of Molecular, Cell and Systems Biology, University of Glasgow, Room 402 Davidson Building, Glasgow G12 8QQ, Scotland