1. Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
2. Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
3. Department of Chemistry–Ångström Laboratory, Uppsala University, P.O. Box 538, SE-751 21 Uppsala, Sweden
4. Department of Chemistry, École normale supérieure de Lyon, 69342 Lyon, France
5. Department of Chemistry–BMC, Uppsala University, P.O. Box 576, SE-751 23 Uppsala, Sweden
6. Laboratoire CEISAM - UMR CNRS 6230, Université de Nantes, 44300 Nantes, France