1. College of Science
2. Northwest A&F University
3. Yangling
4. Shanxi 712100
5. P. R. China
6. School of Chemistry and Environment
7. South China Normal University
8. Key Laboratory of Theoretical Chemistry of Environment
9. Ministry of Education
10. Guangzhou
11. Department of Chemistry and Center for Computational Chemistry
12. University of Georgia
13. Athens
14. USA