O.V. Ovchinnikov - Dr.Sci. (Phys.-Math.), Associate Professor, Voronezh State University. Е- mail: ovchinnikov_o_v@rambler.ru M.S. Smirnov - Ph.D. (Phys.-Math.), Associate Professor, Voronezh State University. Е- mail: smirnov_m_s@mail.ru I.G. Grevtseva - Research Scientist, Voronezh State University. Е-mail: grevtseva_ig@inbox.ru T.S. Kondratenko - Ph.D. (Phys.-Math.), Voronezh State University. Е- mail: tamara-shatskikh@rambler.ru A.S. Perepelitsa - Research Scientist, Voronezh State University. Е- mail: a-perepelitsa@yandex.ru A.V. Evtuhova - Research Scientist, Voronezh State University. Е- mail: chemists-ann@mail.ru