1. Oles Honchar Dnipro National University, Gagarina 72, 49010 Dnipro, Ukraine
2. Applied Physics Department, Tafila Technical University, P.O. Box 40, Al-Eis 66141, Tafila, Jordan
3. Technische Universität Chemnitz, Institute of Chemistry, Str. der Nationen 62, D-09111 Chemnitz, Germany