1. Department of Physics, Faculty of Science, Ondokuz Mayıs University, Samsun, Turkey
2. Department of Chemistry, Faculty of Science, Ondokuz Mayıs University, Samsun, Turkey
3. Department of Physics, Faculty of Science, Atatürk University, Erzurum, Turkey
4. Department of Physics, Faculty of Arts and Science, Sinop University, Sinop, Turkey