[1] Muslim Arts Coll, Dept Phys & Res Ctr, Thiruvithankodu 629174, Tamil Nadu, India
[2] Manonmaniam Sundaranar Univ, Dept Phys, Tirunelveli 627012, Tamil Nadu, India
[3] Cent Univ Tamil Nadu, Sch Basic & Appl Sci, Dept Phys, Thiruvarur 610005, Tamil Nadu, India