1. Department of Physics and Research Centre, Malankara Catholic College, Mariagiri, Tamilnadu, India
2. Manonmaniam Sundaranar University, Tirunelveli, Tamilnadu, India
3. Department of Physics and Research Centre, Muslim Arts College, Tiruvithancode, Tamilnadu, India
4. Department of Physics and Research Centre, St.Cyril’s College, Adoor, Pathanamthitta, Kerala, India