1. Faculty of Physics
2. Vilnius University
3. LT-10222 Vilnius
4. Lithuania
5. Institute of Low Temperature and Structure Research
6. Polish Academy of Sciences
7. PL-50-950 Wroclaw 2
8. Poland
9. Institute of Chemistry
10. LT-10257 Vilnius
11. Center for Physical Sciences and Technology
12. Department of Experimental Physics
13. Wroclaw University of Science and Technology
14. PL-50-370 Wroclaw