1. Deparment of Physics, Norwegian University of Science and Technology, Højskoleringen 5, 7491 Trondheim, Norway
2. Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
3. Tokyo Institute of Technology, 2-12-1-H61 Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan
4. ESRF—The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
5. Department of Physics, Technical University of Denmark, Fysikvej 307, 2800 Kgs. Lyngby, Denmark