1. Division
of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, Roslagstullsbacken 15, S-106 91 Stockholm, Sweden
2. School
of Chemistry and Biochemistry and Center for Organic Materials for
All-Optical Switching (COMAS), Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
3. Department
of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
4. Department
of Physics, Chemistry and Biology, Linköping University, S-581 83 Linköping, Sweden
5. Interdisciplinary
Center for Scientific Computing, Ruprecht-Karls University, Im Neuenheimer
Feld 205, 69120 Heidelberg, Germany
6. Physical
Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia