1. Department of Chemistry and Cherry Emerson Center for Scientific Computation, Emory University 1 , Atlanta, Georgia 30322, USA
2. Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University 2 , Beijing 100875, China
3. Department of Chemistry and Biochemistry, Iona University 3 , New Rochelle, New York 10801, USA
4. Center for Computational Molecular Science and Technology, School of Chemistry and Biochemistry, Georgia Institute of Technology 4 , Atlanta, Georgia 30332-0400, USA