1. Department of Chemistry, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt
2. Department of Chemistry, Faculty of Science, King Khalid University, P. O. Box 9004, Abha 61421, Saudi Arabia
3. Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt
4. Department of Basic Sciences, Obour High Institute for Engineering and Technology, Egypt