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. School of Physical Science Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road Kolkata 700032 West Bengal India
4. School of Mathematical & Computational Sciences Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road Kolkata 700032 West Bengal India