1. Graduate School of Natural and Applied Sciences, Physics, Eskişehir Osmangazi University, Eskişehir, Turkey
2. Faculty of Arts and Sciences, Department of Physics, Eskişehir Osmangazi University, Eskişehir, Turkey
3. Faculty of Arts and Sciences, Department of Chemistry, Eskişehir Osmangazi University, Eskişehir, Turkey
4. Faculty of Engineering, Department of Physics, Hacettepe University, Ankara, Turkey