1. Mulliken Center for Theoretical Chemistry Institute for Physical and Theoretical Chemistry Beringstr. 4 Bonn D‐53115 Germany
2. Institute for Advanced Simulation Jülich Supercomputing Centre, Forschungszentrum Jülich GmbH Wilhelm‐Johnen‐Straße Jülich D‐52425 Germany
3. Otto Schott Institute of Materials Research Faculty of Physics and Astronomy Friedrich‐Schiller‐Universität Jena Löbdergraben 32 Jena D‐07743 Germany