1. Department of Physics, Madras Christian College, East Tambaram, Tamil Nadu, India
2. University of Madras, Chennai, Tamil Nadu, India
3. Department of Physics, Arignar Anna Government Arts College, Cheyyar, Tamil Nadu, India
4. Department of Physics, Puratchi Thalaivar Dr. M. G. R Government Arts and Science College, Uthiramerur, Tamil Nadu, India
5. PG & Research Department of Physics, Queen Mary’s College, Chennai, Tamil Nadu, India