1. Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
2. Centre for Materials Science and Nanotechnology, University of Oslo, P.O. Box 1126, Blindern, N-0316 Oslo, Norway
3. Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
4. UiT-The Arctic University of Norway, N-9037 Tromsø, Norway