1. Institute for Ion Physics and Applied Physics and Center for Biomolecular Sciences (CMBI), University of Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
2. Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal
3. Institut de Physique des 2 Infinis, CNRS/IN2P3, UMR5822, Université de Lyon, Université Claude Bernard Lyon 1, 43 Bd du 11 november 1918, 69622 Villeurbanne, France