Affiliation: | 1. Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, India;2. Department of Physics, Andhra Loyola Institute of Engineering and Technology, Vijayawada, India;3. Department of Physics, Andhra Loyola College, Vijayawada, India;4. Department of Chemistry, SRM Institute of Science and Technology, Kattankulathur, India |