1. Department of Industrial Chemistry & Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
2. Department of Physics, SRM University─AP, Amaravati, Andhra Pradesh 522240, India
3. Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India