1. CNR - Istituto Officina dei Materiali, TASC Laboratory, S.S. 14, km 163.5, 34149 Basovizza (TS), Italy
2. Department
of Physics, University of Trieste, I-34123 Trieste, Italy
3. Elettra - Sincrotrone Trieste SCpA, S.S. 14, km 163.5, 34149 Basovizza (TS), Italy
4. CNR - Istituto di Struttura della Materia, Trieste, Basovizza Area Science Park, 34149 Trieste, Italy
5. Chemistry
Laboratory, Faculty of Life and Social Sciences, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
6. Department
of Physics, Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana, Slovenia
7. Department
of Physics, University of Bologna, viale Berti Pichat 6/2, 40127 Bologna, Italy
8. Dept.
of Engineering and Architecture, University of Trieste, v. Valerio 10, 34100 Trieste, Italy