1. Department of Physics, Hemvati Nandan Bahuguna Garhwal University (A Central University), Srinagar, Garhwal 246174, Uttarakhand, India
2. Department of Pharmaceutical Science and Chinese Central Medicines, South West University Chongqing, Chongqing 400715, China
3. Department of Physics, Shri Guru Ram Rai Post Graduate College, Dehradun 248001, Uttarakhand, India
4. Department of Physics, Government Post Graduation College New Tehri, Tehri Garhwal 249001, Uttarakhand, India
5. Department of Physics, H. N. B. Garhwal University, Badshahithaul Campus, Tehri Garhwal 249199, Uttarakhand, India
6. Uttarakhand Science Education and Research Centre, Dehradun 248001, Uttarakhand, India