1. Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
2. Department of Engineering Physics, Tashkent State Technical University, Do’rmon Yuli 33, 100125 Tashkent, Uzbekistan
3. Universität Göttingen, Drittes Physikalisches Institut, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany