1. Department of Physics, Vignan Institute of Technology and Science, Deshmukhi, India
2. Department of Physics, JNTUH College of Engineering Sulthanpur, Medak, India
3. Department of Physics, PB Siddhartha College of Arts & Science, Vijayawada, India
4. Department of Chemistry, JKCC Acharya Nagarjuna University, Guntur, India