1. Nik N A M A Ghani:
Department of Physics, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
2. Imam Hossain:
Department of Physics, Rabigh College of Science and Arts, King Abdulaziz University, 21911 Rabigh, P.O. Box 344, Saudi Arabia; Department of Physics, Shah Jalal University of Science and Technology, Sylhet 3114, Bangladesh
3. Mohammad A Saeed:
Department of Physics, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
4. Hewa Y Abdullah:
Department of Physics, College of Education, Scientific Department, Salahaddin University, Errbil, Krg, Iraq
5. Magdy Hussein:
Department of Physics, Rabigh College of Science and Arts, King Abdulaziz University, 21911 Rabigh, P.O. Box 344, Saudi Arabia; Department of Physics, Faculty of Science, Zagazig University, Zagazig, Egypt