J Fousek; Z Málek; A J Salim; N S Al Ali; J Fousek; Department of Physics, College of Science and College of Education, University of Baghdad, Baghdad, Adhamiya, Iraq; Z Málek; Department of Physics, College of Science and College of Education, University of Baghdad, Baghdad, Adhamiya, Iraq; A J Salim; Department of Physics, College of Science and College of Education, University of Baghdad, Baghdad, Adhamiya, Iraq; N S Al Ali; Department of Physics, College of Science and College of Education, University of Baghdad, Baghdad, Adhamiya, Iraq