Department of Physics, Batanagar Institute of Engineering, Management and Science (Techno India Group), Kolkata, India
Department of Physics, Indian Institute of Engineering, Science & Technology (IIEST), Shibpur,Howrah, India
Copyright © 2014 Nagendra Nath Mondal et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.