1. Laboratory of Physics of Matter and Radiation , Faculty of Sciences, , Oujda, 60000 , Morocco
2. Mohammed First University , Faculty of Sciences, , Oujda, 60000 , Morocco
3. Faculty of Science, University Mohammed V in Rabat , Rabat B.P. 1014 , Morocco
4. National School of Applied Sciences, Mohammed First University , Oujda 60000 , Morocco