1. Department of Chemistry, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India
2. Raman Centre for Atomic Molecular and Optical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S C Mullick Road, Kolkata 700032, India
3. Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry, University of Tromsø − The Arctic University of Norway, Tromsø N-9037, Norway