Institution: | a Department of Physics, Bishop Heber College, Tiruchirappalli 620017, India b Physical Metallurgy Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India c Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India d Department of Physics, St. Joseph’s College, Tiruchirappalli 620002, India |