1. Beijing Computational Science Research Center
2. Beijing
3. P. R. China
4. Department of Physics and Astronomy
5. University of California
6. Laboratory of Theoretical and Computational Chemistry
7. Institute of Theoretical Chemistry
8. Jilin University
9. Changchun 130023
10. Irvine
11. USA
12. Department of Chemistry & Biochemistry
13. California State University
14. Northridge