1. Department of Chemistry and Pharmacy and Interdisciplinary Center for Molecular Materials (ICMM); University of Erlangen-Nuremberg (FAU); Henkestrasse 42 91054 Erlangen Germany
2. Department of Physics; University of Erlangen-Nuremberg (FAU); Erwin-Rommel-Strasse 1 91058 Erlangen Germany
3. Lehrstuhl für Theoretische Chemie and Interdisciplinary Center for Molecular Materials (ICMM); University of Erlangen-Nuremberg (FAU); Egerlandstrasse 3 91058 Erlangen Germany
4. Current address: Department of Chemistry; University of Alberta; Edmonton Alberta T6G 2G2 Canada