1. Department of Chemistry, University of California, Berkeley, California 94720, United States
2. Department of Chemistry, Minnesota Supercomputing Institute, and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
3. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States