1. Department of Molecular Theory and Spectroscopy, Max-Planck Institute for Kohlenforschung, Kaiser Wilhelm-Platz-1, 45470 Mülheim-an-der-Ruhr, Germany
2. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
3. Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Egerlandstrasse 1, 91058 Erlangen, Germany
4. Lehrstuhl für Chemische Physik und Materialwissenschaften, Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany
5. Department of Molecular Theory and Spectroscopy, Max-Planck Institute for Chemical Energy Conversion, Stiftstrasse 34−36, 45470 Mülheim-an-der-Ruhr, Germany
6. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Akad. Georgi Bontchev Street 11, 1113 Sofia, Bulgaria