1. Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14 50-383 Wrocław, Poland
2. W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland
3. Department of Experimental Physics, Faculty of Fundamental Problems of Technology, University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland