1. Physics
Department, University of Trieste, via Valerio 2, I-34127 Trieste, Italy
2. Abteilung
Anorganische
Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
3. Physics
Department and CENMAT, University of Trieste, via Valerio 2, I-34127 Trieste, Italy
4. IOM-CNR Laboratorio TASC, Area Science Park, S.S. 14 km 163.5, I-34149 Basovizza, Trieste, Italy