1. Mulliken Center for Theoretical Chemistry, Clausius Institute of Physical and Theoretical Chemistry, University of Bonn, Beringstraße 4-6, D-53115 Bonn, Germany
2. Clausius Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstraße 12, D-53115 Bonn, Germany
3. Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
4. Transdisciplinary Research Area “Building Blocks of Matter and Fundamental Interactions” (TRA Matter), University of Bonn, D-53115 Bonn, Germany