Affiliation: | 1. Department of Physics, Presidency College, Chennai 600005, India;2. Department of Physics, Vel Tech Dr. RR & Dr. SR Technical University, Avadi, Chennai 600062, India;1. Department of Physics, Anna Adarsh College for Women, Chennai 600 040, India;2. PG & Research Department of Physics, Pachaiyappa''s College, Chennai 600 030, India |