1. Department of Physics, D. J. College, Baraut, Uttar Pradesh 250611, India
2. Department of Chemistry, Janta Vedic College, Baraut, Uttar Pradesh 250611, India
3. Department of Physics, Stockholm University, Alba Nova University Center, 106 91 Stockholm, Sweden
4. High Pressure and Synchrotron Radiation Physics Divison, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
5. Homi Bhabha National Institute, Mumbai 400 088, India