1. Department
of Chemistry and Biochemistry, California State University Northridge, Northridge, California 91330, United States
2. Beijing Computational
Science Research Center, Beijing 100193, P. R. China
3. Materials
Research Laboratory, University of California, Santa Barbara, California 93106-5050, United States
4. Department
of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, United States
5. Institute
of Theoretical Chemistry, Jilin University, Changchun 130023, P. R. China