1. Laboratory of Inorganic Materials Chemistry; Department of Chemical Engineering and Chemistry; Eindhoven University of Technology; P.O. Box 513 5600MB Eindhoven The Netherlands
2. European Synchrotron Radiation Facility; 71 Avenue des Martyrs 38000 Grenoble France
3. Huygens-Kamerlingh Onnes Laboratory; Leiden University; P.O. Box 9504 2300 RA Leiden The Netherlands
4. CNR-SPIN; Area della Ricerca di Roma 2 - “Tor Vergata”; Via del Fosso del Cavaliere 100, I- 00133 Roma Italy
5. Physikalisch-Chemisches Institut; Justus-Liebig-Universität Gießen; Heinrich-Buff-Ring 58 35392 Gießen Germany