1. Department of Physics, Research Centre, Nesamony Memorial Christian College, Marthandam, India
2. Manonmaniam Sundaranar University Abishekapatti, Tirunelveli, India
3. Department of Chemistry, NSS College Ottapalam, Palakkad, India
4. Department of Physics, Centre for Molecular and Biophysics Research, Mar Ivanios College, Thiruvanathapuram, India