1. Maharaja Ganga Singh University Bikaner Rajasthan 334001 India
2. Department of Physics Engineering College Bikaner Rajasthan 334004 India
3. Department of Physics M.L.B. Government College Nokha 334803 Bikaner Rajasthan India
4. Nanophysics Laboratory Department of Physics Government Dungar College Bikaner Rajasthan 334001 India