1. Department of Applied Physics Faculty of Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor 43600 Malaysia
2. Department of Physics College of Science Imam Abdulrahman Bin Faisal University P.O. Box 1982 Dammam 31441 Saudi Arabia
3. Basic and Applied Scientific Research Center College of Science Imam Abdulrahman Bin Faisal University P.O. Box 1982 Dammam 31441 Saudi Arabia