1. Department of Medical Physics, Bharathiar University, Coimbatore, India
2. Department of Physics, Bharathiar University, Coimbatore, India
3. Postdoctoral Fellow, Department of Chemistry, National Cheng Kung University, Tainan City, 701, Taiwan
4. International Research Center of Spectroscopy and Quantum Chemistry – IRC SQC, Siberian Federal University, 79 Svobodny pr., 660041 Krasnoyarsk, Russia
5. Departamento de Física Aplicada I, Escuela Politécnica Superior, Universidad de Sevilla, Seville E-41011, Spain