Institution: | 1.PG and Research Department of Physics, Bishop Heber College (Autonomous) (Affiliated to Bharathidasan University), Tamil Nadu 620 017, Tiruchirappalli, India ;2.Department of Physics, Alagappa University, Karaikudi, Tamil Nadu, 630 004, India ;3.Department of Physics, Scott Christian College (Autonomous) (Affiliated to Manonmaniam Sundaranar University), Tamil Nadu, 629 003, Nagercoil, India ; |