1. Department of Physics, School of Basic and Applied SciencesCentral University of Tamil Nadu Thiruvarur 610 005 India
2. Department of Science and HumanitiesIndian Institute of Information Technology Tiruchirappalli, Tiruchirappalli 620 015 Tamil Nadu India
3. Centro de Fısica das Universidades do Minho e do Porto (CF-UM-UP), Campus de Gualtar 4710-057 Braga Portugal
4. Department of Chemistry, School of Basic and Applied SciencesCentral University of Tamil Nadu Thiruvarur 610 005 India