1. Department of Chemistry, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Avadi, Chennai, India
2. Department of Physics, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Avadi, Chennai, India
3. Department of Physics, Vel Tech HighTech Dr. Rangarajan Dr. Sakunthala Engineering College, Avadi, Chennai, India
4. Department of Physics, Priyadarshini Engineering College, Chettiyappanur, Vaniyambadi, Tamil Nadu, India
5. Department of Physics, Arignar Anna Govt. Arts College, Cheyyar, Tamil Nadu, India