1. Graduate School of Natural and Applied Sciences, Physics, Eskişehir Osmangazi University, TR-26480 Eskişehir, Turkey
2. Faculty of Arts and Sciences, Department of Physics, Eskişehir Osmangazi University, TR-26480 Eskişehir, Turkey
3. Faculty of Arts and Sciences, Department of Chemistry, Eskişehir Osmangazi University, TR-26480 Eskişehir, Turkey
4. Faculty of Engineering, Department of Physics, Hacettepe University, TR-06800 Beytepe Ankara, Turkey