1. Faculty of Science, Department of Physical and Macromolecular Chemistry, Charles University, Hlavova 8, Prague 2 128 40, Czech Republic
2. Institute of Macromolecular Chemistry AS CR, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
3. Faculty of Mathematics and Physics, Institute of Physics, Charles University, Ke Karlovu 5, Prague 2 121 16, Czech Republic
4. J. Heyrovsky Institute of Physical Chemistry of the ASCR, v.v.i, Dolejškova 3, 182 21 Prague 8, Czech Republic