1. James
Franck Institute, The University of Chicago, Chicago, Illinois 60637, United States
2. Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
3. Department
of Physics, The University of California—San Diego, La Jolla, California 92093, United States
4. Center
for Advanced Radiation Sources, The University of Chicago, Chicago, Illinois 60637, United States
5. Department
of Chemical Engineering, City College of New York, New York City, New York 10031, United States
6. Institute
for Biophysical Dynamics, The University of Chicago, Chicago, Illinois 60637, United States