1. Institute of Physics, Bagdad ul Jadeed, Islamia University of Bahawalpur, Bahawalpur, Pakistan
2. Department of Chemistry, Faculty of Science, King Khalid University, P. O. Box 9004, Abha 61413, Saudia Arabia
3. Department of Physics, Rahim Yar Khan Campus, Islamia University of Bahawalpur, Bahawalpur, Pakistan