1. Department of Chemistry –Ångström Laboratory, Uppsala University, Box 523, SE-75120 Uppsala, Sweden
2. Centre for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, SE-22100 Lund, Sweden
3. Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, USA
4. Department of Physics – Ångström Laboratory, Uppsala University, Box 523, SE-751 20 Uppsala, Sweden
5. Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark