1. Department of Chemistry, University of California, Berkeley, California 94720, United States
2. Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. Department of Chemistry, Kenneth S. Pitzer Center for Theoretical Chemistry, University of California, Berkeley, California 94720, United States
4. Kavli Energy Nanoscience Institute at Berkeley, Berkeley, California 94720, United States
5. Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States