1. Institute of Atomic and Molecular Physic, Jilin University, Changchun 130012, China
2. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University, Changchun 130012, China
3. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130023, People's Republic of China
4. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian, 116024, China
5. Department of Chemistry, University of Puerto Rico, San Juan, PR 00931, USA