1. Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
2. Centre for Theoretical and Computational Chemistry,
Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
3. Institut Charles Gerhardt, CNRS 5253, Université Montpellier 2, cc 1501,
Place Eugène Bataillon, F-34095 Montpellier, France