1. Dipartimento di Chimica e Chimica Industriale
2. Università degli studi di Pisa
3. 56126 Pisa, Italy
4. Department of Solid State Physics
5. Jožef Stefan Institute
6. Ljubljana, Slovenia
7. Institute of Physics
8. Academy of Sciences of the Czech Republic
9. 182 21 Prague 8, Czech Republic
10. University of Warsaw
11. Department of Chemistry
12. 02-089 Warszawa, Poland