1. Institute of Physics, Kazimierz Wielki University, Plac Weyssenhoffa 11, PL-85072 Bydgoszcz, Poland
2. Department of Chemical Technology and Pharmaceuticals, Faculty of Pharmacy, Collegium Medicum Nicolaus Copernicus University, 2 Jurasz St., PL-85089 Bydgoszcz, Poland
3. Department of Physical Chemistry, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain