1. Post Graduate and Research Department of Physics, Government Arts College, Tiruvanamalai, 606 601, India
2. Department of Physics, C. Abdul Hakeem College, Melvisharam, Tamilnadu, 632509, India
3. Department of Physics, Global Institute of Engineering & Technology, Vellore, Tamilnadu, 632509, India
4. Environment and Safety Division, RSEG, EIRSG, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India