1. Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
2. Peptide Research Laboratory, Department of Studies in Chemistry, Central College Campus, Bangalore University, Bangalore 560 001, India
3. CCLRC, Daresbury Laboratory, Warrington, Cheshire WA4 4AD, United Kingdom
4. Department of Chemistry, University of Manchester, Manchester, M13 9PL, United Kingdom
5. Department of Physics, Jadavpur University, Kolkata 700032, India