1. P.G & Research Department of Physics, N.M.S.S.V.N. College, Madurai, Tamil Nadu, India
2. PG Department of Physics, Mannar Thirumalai Naicker College, Pasumalai, Madurai, Tamil Nadu, India
3. UGC-DAE CSR, Kalpakkam Node, Kokilamedu – 603 104, Tamil Nadu, India