1. Department of Physics; Bhilai Institute of Technology; Raipur Kendri, New Raipur (C.G.) India
2. Department of Postgraduate Studies and Research in Physics; Rani Durgavati University; Jabalpur 482001 India
3. 547, HIG-1, Sector-2; Pt. Deendayal Upadhyay Nagar; Raipur Chattisgarh 492010 India