1. School of Chemical Science, Indian Association for the Cultivation of Science, 2A & 2B, Raja S. C. Mullick Road, Kolkata-700032, West Bengal, India
2. Department of Physics, Jadavpur University, Jadavpur, Kolkata 700 032, India
3. Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy-502284, Telangana, India
4. School of Physical Science, Indian Association for the Cultivation of Science, 2A & 2B, Raja S. C. Mullick Road, Kolkata-700032, West Bengal, India