1. Physics Department “E. R. Caianiello”
2. University of Salerno
3. Fisciano 84084
4. Italy
5. Interdepartmental Centre NanoMates
6. Department of Physical and Chemical Science
7. University of L'Aquila
8. and CNR-SPIN L'Aquila
9. L'Aquila
10. AMBER & School of Chemistry
11. Trinity College Dublin
12. Dublin 2
13. Ireland
14. CNR-SPIN Salerno