[1] Manonmaniam Sundaranar Univ, St Johns Coll, Dept Phys, Palayankottai 627012, Tamil Nadu, India
[2] Manonmaniam Sundaranar Univ, St Johns Coll, Res Ctr, Palayankottai 627012, Tamil Nadu, India
[3] Manonmaniam Sundaranar Univ, Sri KGS Arts Coll, Dept Phys, Srivaikuntam 628619, Tamil Nadu, India
[4] Manonmaniam Sundaranar Univ, St Johns Coll, Dept Phys, Palayankottai, Tamil Nadu, India
[5] Manonmaniam Sundaranar Univ, Sarah Tucker Coll, Dept Phys, Tirunelveli 627007, Tamil Nadu, India
[6] Manonmaniam Sundaranar Univ, Sarah Tucker Coll, Res Ctr, Tirunelveli 627007, Tamil Nadu, India
[7] Manonmaniam Sundaranar Univ, Dept Phys, Aditanar Coll Arts & Sci, Tiruchendur 628216, Tamil Nadu, India