1. Department of Physical and Theoretical Chemistry, Faculty of Science; Comenius University; Mlynska Dolina SK-84215 Bratislava 4 Slovak Republic
2. Department of Physical Chemistry, Faculty of Science; P.J. Šafárik University; Moyzesova 11 SK-04154 Košice Slovak Republic
3. Center SIX, Faculty of Electrical Engineering and Communication; Brno University of Technology; Technicka 12 CZ-61600 Brno Czech Republic
4. Institute of Materials Research; Slovak Academy of Sciences; Watsonova 47 SK-04353 Košice Slovak Republic