1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
2. Department of Physics, Nanyang Normal University, Nanyang 473061, China
3. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
4. School of Science, Northwestern Polytechnic University, Xi’an 710072, China
5. University of Chinese Academy of Sciences, Beijing 100049, China