1. Department of Chemistry, University of Calcutta, 92 A.P.C Road, Kolkata-700009, West Bengal, India
2. Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry, University of Tromsø-The Arctic University of Norway, 9037 Tromsø, Norway
3. Norwegian Defence Research Establishment, P.O.Box 25, 2027 Kjeller, Norway