1. Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, 81310Johor Bahru, Malaysia
2. Department of Physics, Federal College of Education Zaria, P.M.B. 1041, 810282Zaria, Kaduna State, Nigeria
3. Physics Department, College of Science, Princess Nourah Bint Abdulrahman University, Riyadh11564, Saudi Arabia
4. Physics Department, Faculty of Science, University of Hail, Hail55211, Saudi Arabia
5. Department of Science and Laboratory Technology, Jigawa State Polytechnic, 720101Dutse, Nigeria
6. Department of Chemistry, University of Alberta, Edmonton, AlbertaT6G 2G2, Canada