Affiliation: | Department of Physics, Faculty of Science, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia; E-Mails: mhmzaid@gmail.com (M.H.M.Z.); sidekaa@science.upm.edu.my (S.H.A.A.); Azmizak@gmail.com (A.Z.); mohdsabri@umt.edu.my (M.S.M.G.). |