1. Department of Physics and Research Centre, Malankara Catholic College, Kaliyakkavilai, Tamil Nadu, India
2. Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu, India
3. Department of Chemistry and Research Centre, Erode Sengunthar Engineering College, Perunthurai, Tamil Nadu, India
4. Department of Physics and Research Centre, Muslim Arts College, Thiruvithamcode, Tamil Nadu, India