1. Institute of Physics of the ASCR, v.v.i., Cukrovarnická 10, 162 53 Prague 6, Czech Republic
2. Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech Republic
3. Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic
4. Institute of Macromolecular Chemistry of the ASCR, v.v.i., Heyrovského náměstí 2, 162 06 Prague 6, Czech Republic
5. Institute of Inorganic Chemistry of the ASCR, v.v.i., 250 68 Řež, Czech Republic