1. Department of Chemistry, Centre for Materials and Nanoscience (SMN), University of Oslo, P.O. Box 1033, Blindern, NO-0315 Oslo, Norway
2. Center for Molecular Modeling (CMM), Ghent University, Tech Lane Ghent Science Park Campus A, Technologiepark 46, 9052 Zwijnaarde, Belgium
3. Department of Physics, Centre for Materials and Nanoscience (SMN), University of Oslo, P.O.
Box 1033, Blindern, NO-0315 Oslo, Norway