1. Institute of Nuclear Physics of CAS, 250 68 Rez, Czech Republic
2. Department MIFT, Messina University, V. le F.S. d’Alcontres 31, 98166 Messina, Italy
3. Department of Physics, Faculty of Science, J. E. Purkinje University, Ceske Mladeze 8, 400 96 Usti nad Labem, Czech Republic
4. Centre of Nanomaterials and Biotechnology, Faculty of Science, Jan Evangelista Purkyně University in Usti nad Labem, 400 96 Usti nad Labem, Czech Republic
5. Department of Solid State Engineering, Institute of Chemical Technology, 166 28 Prague, Czech Republic