1. Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
2. Department of Physics and Astronomy, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
3. Department of Physics and Astronomy, University of British Columbia, Vancouver Campus 325-6224, Agricultural Road, Vancouver, BC V6T 1Z1, Canada
4. Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
5. Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
6. Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States