1. Department of Chemistry, Karnatak University, Dharwad 580003, India
2. Laser Spectroscopy (DRDO/KU) Programme, Department of Physics, Karnatak University, Dharwad, 580003, India
3. Dr Prabhakar Kore Basic Science Research Centre, KLE Academy of Higher Education and Research (KLE University), Belagavi, 590010, India