1. Istituto di Struttura della Materia del CNR, v. Salaria Km 29,300
- C.P. 10 I-00015, Monterotondo Stazione (RM), Italy
2. Department of Physics, University of Cagliari, Cittadella Universitaria, 09042
Monserrato (Ca), Italy
3. Istituto
per l'Officina dei Materiali
(CNR-IOM), UOS Cagliari SLACS, Cittadella Universitaria, I-09042 Monserrato (Ca), Italy
4. Department of Chemistry, Physics,
and Environment, University of Udine, via
delle Scienze 208, 33100 Udine, Italy
5. DEMOCRITOS IOM-CNR National Simulation Center, 34014 Trieste, Italy