1. Faculty of Physics; Lomonosov Moscow State University, Leninskie Gory, 1-2; Moscow 119991 Russia
2. Department of General Physics; Tver State University, Sadovyj per., 35; Tver 170002 Russia
3. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova st., 28; Moscow 119991 Russia
4. Institute of New Carbon Materials and Technologies, Leninskie Gory, 1-11; Moscow 119991 Russia
5. Faculty of Chemistry; Lomonosov Moscow State University, Leninskie Gory, 1-3; Moscow 119991 Russia