1. European Synchrotron Radiation Facility, BP220, F-38043, Grenoble, France
2. LPMCN, Université Claude Bernard Lyon 1 and CNRS, 69622, Villeurbanne, France
3. CNR-IPCF, Rome University “La Sapienza”, Piazzale A. Moro 2, I-00185 Roma, Italy
4. Department of Physics, Perugia University, Via A. Pascoli, I-06100 Perugia, Italy
5. Department of Physics, Rome University “La Sapienza”, Piazzale A. Moro 2, I-00185 Roma, Italy
6. Department of Applied Sciences, Technological Educational Institute of Thessaloniki, 57400 Sindos, Greece
7. Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes (FORTH/ICE-HT), P.O. Box 1414, GR-26504 Patras, Greece