1. College of Chemistry and Molecular Engineering; Zhengzhou University; 100 Kexue Road Zhengzhou 450001 China
2. State Key Laboratory of Supramolecular Structure and Materials; College of Chemistry; Jilin University; Changchun 130012 China
3. State Key Laboratory of Superhard Materials; College of Physics; Jilin University; Changchun 130012 China
4. Institute of Atomic and Molecular Physics; Jilin University; Changchun 130012 China
5. Department of Physics and Engineering Physics; University of Saskatchewan; Saskatoon S7N5E2 Canada