Department of Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, The University of Chicago, Chicago, Illinois, United States of America.|Department of Physics & Astronomy, University of Rochester, Rochester, New York, United States of America.|Department of Physics & Astronomy, University of Rochester, Rochester, New York, United States of America.|Department of Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, The University of Chicago, Chicago, Illinois, United States of America.