1. Department of Physical and Chemical Sciences
2. University of L'Aquila
3. 67100 L'Aquila
4. Italy
5. CNR-SPIN L'Aquila
6. Key Laboratory of Applied Chemistry
7. Yanshan University
8. Qinhuangdao
9. P. R. China
10. CNR-IMM Institute for Microelectronics and Microsystems
11. School of Science and Technology Physics Division
12. University of Camerino
13. Department of Physics
14. Tor Vergata University of Rome
15. 00133 Roma
16. Faculty of Applied Physics and Mathematics
17. Gdansk University of Technology
18. Gdansk
19. Poland
20. Department of Chemistry
21. Princeton University
22. Princeton
23. USA