1. Institute of Physics, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland
2. Department of Inorganic Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 2, 20-031 Lublin, Poland
3. Institute of Applied Physics Problems, Belarussian State University, Minsk, Belarus