1. Department of Physics; Narula Institute of Technology; Agarpara Kolkata 700 109 India
2. Department of Physics; Sambhu Nath College; Labpur Birbhum 731 303 India
3. Department of Physics; Aliah University; Newtown Kolkata 700 156 India
4. Department of Physics; Acharya Prafulla Chandra College; New Barrackpore Kolkata 700 131 India