1. Centre for Interdisciplinary Research and Education, 404B Jodhpur Park, Kolkata 700068, INDIA
2. University of Minnesota Duluth-Natural Resources Research Institute (UMD-NRRI) and Department of Chemistry & Biochemistry, University of Minnesota Duluth, Duluth, MN 55811, USA
3. Department of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India