1. European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble Cedex, France
2. Laboratorio TASC, CNR-IOM Istituto Officina dei Materiali, Area Science Park − Basovizza, I-34149, Trieste, Italy
3. Institute of Biophysics and Nanosystems Research, Austrian Academy of Sciences, A-8042 Graz, Austria