1. Department of Chemistry, Chicago Center for Theoretical Chemistry, University of Chicago, Chicago, Illinois 60637, United States
2. Pritzker School of Molecular Engineering, Chicago Center for Theoretical Chemistry, University of Chicago, Chicago, Illinois 60637, United States
3. Computational Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, United States
4. Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, United States
5. Department of Physics, University of Wisconsin − Madison, Madison, Wisconsin 53726, United States