1. Centre for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, Lund SE-22100, Sweden
2. Chemical Physics Division, Department of Chemistry, Lund University, Box 124, Lund SE-22100, Sweden
3. Theoretical Chemistry Division, Department of Chemistry, Lund University, Box 124, Lund SE-22100, Sweden
4. Department of Chemistry─Ångström Laboratory, Uppsala University, Box 523, Uppsala SE-751 20, Sweden
5. Department of Physics─Ångström Laboratory, Uppsala University, Box 523, Uppsala SE-751 20, Sweden