1. Institute of Chemical Physics, University of Latvia, 19 Raina Blvd., Riga LV-1586, Latvia
2. Faculty of Chemistry, Silesian University of Technology, B. Krzywoustego Street 6, 44-100 Gliwice, Poland
3. Faculty of Biology, University of Latvia, 1 Jelgavas Str., Riga LV-1004, Latvia
4. Faculty of Chemistry, University of Latvia, 19 Raina Blvd., Riga LV-1586, Latvia
5. Faculty of Physics, Mathematics, and Optometry, University of Latvia, 3 Jelgavas Str., Riga LV-1004, Latvia