1. Indian Institute of Astrophysics, Bangalore 560034, India
2. The James Franck
Institute and Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United
States
3. Department of Chemistry,
Bengal Engineering and Science
University, Shibpur, Howrah 711103, India
4. Department of Physics, Maulana Azad College, 8 Rafi Ahmed Kidwai Road, Kolkata
700013, India