1. Laboratory for Shock Wave and Detonation Physics, Institute of Fluid Physics, P. O. Box 919-102, Mianyang, People's Republic of China
2. School of Science, Southwest University of Science and Technology, Mianyang, 610064, People's Republic of China
3. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People's Republic of China