1. College of Physics
2. Chongqing University
3. Chongqing 401331
4. P. R. China
5. Beijing Key Laboratory and Institute of Microstructure and Property of Advanced Materials
6. Beijing University of Technology
7. Beijing 100124
8. Analytical and Testing Center
9. College of Resources and Environmental Science
10. South-Central University for Nationalities
11. Wuhan 430074