1. Department of Chemistry − Ångström Laboratory, Uppsala University, Box 538, SE 751 21 Uppsala, Sweden
2. MAX IV Laboratory, Lund University, Fotongatan 2, SE-221 00 Lund, Sweden
3. Department of Chemistry, Aarhus University, Langelandsgade 140, Aarhus DK-8000, Denmark
4. Department of Physics, Technical University of Denmark, Lyngby 2880, Denmark