Institution: | 1. Physics Department, Faculty of Science, King Abdul Aziz University, Jeddah, Saudi Arabia;
2. Physics Department, Al-Azhar University, Assiut Branch, Assiut 71524, Egypt;
3. Physics Department, King Khalid University, Abha, Saudia Arabia;
4. Physics Department, Assiut University, Assiut 71516, Egypt |