1. Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, 779 00 Olomouc, Czech Republic
2. Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 779 00 Olomouc, Czech Republic
3. Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria
4. IT4Innovations, Technical University of Ostrava, 708 00 Ostrava-Poruba, Czech Republic