1. Department of Physics and Electrical Engineering, Karlstad University, SE-65188 Karlstad, Sweden,
2. Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden,
3. Institute of Physics, Jagiellonian University, 30-059 Kraków, Poland,
4. Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland,
5. Department of Chemistry and Biomedical Sciences, Karlstad University, SE-65188 Karlstad, Sweden.