1. Nanomaterial Research Centre, Faculty of Science, Palacky University in Olomouc, 17, listopadu 1192/12, 77146 Olomouc, Czech Republic
2. Department of Physical Chemistry, Faculty of Science, Palacky University in Olomouc, 17, listopadu 1192/12, 77146 Olomouc, Czech Republic
3. Department of Experimental Physics, Faculty of Science, Palacky University in Olomouc, 17, listopadu 1192/12, 77146 Olomouc, Czech Republic
4. Department of Physical Chemistry, Faculty of Science, Palacky University, Svobody 26, 77146 Olomouc, Czech Republic, Fax: +42‐0585634958