1. School of Chemistry, University of Southampton, Southampton SO17 1BJ, United Kingdom
2. Department of Chemistry, University of Florida, Gainesville 32611, United States
3. Institute for Physics, Johannes Gutenberg University, D-55090 Mainz, Germany
4. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Helmholtz-Institut Mainz, 55128 Mainz, Germany