1. Department of Inorganic Chemistry, University of Chemistry and Technology, Technická 5, 166 28 Prague, Czech Republic
2. Nuclear Physics Institute, Czech Academy of Sciences, v. v. i., 250 68 Řež, Czech Republic
3. Department of Physics, Faculty of Science, J. E. Purkinje University, Pasteurova 3544/1, 400 96 Ústí nad Labem, Czech Republic
4. Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10/112, 162 00 Prague, Czech Republic
5. Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 84104 Bratislava, Slovakia