1. Department of Physics, Periyar Maniammai University, Thanjavur, Tamil Nadu, India
2. Department of Physics, Kanchi Mamunivar Centre for PG Studies, Puducherry, India
3. PG and Research Department of Physics A.V.C. College, Mayiladuthurai, Tamil Nadu, India
4. Department of Physics, St. Joseph College of Arts and Science, Cuddalore, Tamil Nadu, India
5. Kurnakov Institute of General and Inorganic Chemistry, 31 Leninsky Avenue, Moscow 119991, Russia