1. Institute of Forensic Science & Criminology, Panjab University, Chandigarh-160014, India
2. Department of Chemistry, DAV College, Sector-10, Chandigarh, India 160011
3. Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, Punjab, India
4. Department of Physics, National Institute of Technology Srinagar, Jammu and Kashmir, 190006, India
5. Department of Physics, University of the Free State, P. O. Box 339, Bloemfontein ZA9300, South Africa