1. LCPMR, CNRS, Sorbonne Université, UMR7614 Paris, France
2. Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin, F-91192 Gif-sur-Yvette, France
3. Nano and Molecular Systems Research Unit, Faculty of Science, University of Oulu, P.O.
Box 3000, 90014 Oulu, Finland
4. Department of Physics and Astronomy, Uppsala University, P.O. Box 516, 75120 Uppsala, Sweden
5. Department of Physics, University of Washington, Box 351560, Seattle, Washington 98195-1560, United States
6. Division of Natural Sciences, Keuka College, Keuka Park, New York 14478, United States
7. Department of Chemistry, University of Bergen, Allégaten 41, NO-5007 Bergen, Norway
8. Dipartimento di Scienze Chimiche e Farmaceutiche, Universitá di Trieste and IOM-CNR, 34127 Trieste, Italy