1. B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Prospect Nezavisimosti 68, Minsk BY-220072, Republic of Belarus
2. Institute of Chemistry of New Materials, National Academy of Sciences of Belarus, 36, Fr. Skaryna Street, Minsk BY-220141, Republic of Belarus
3. Volgograd State University, University Avenue 100, Volgograd 400062, Russia