1. Department
of Chemistry and Department of Biophysics, University of Michigan, 930 N. University Avenue, Ann Arbor, Michigan 48109, United States
2. Department
of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson
Parkway, Norman, Oklahoma 73019, United States
3. Argonne National Laboratory, APS/XFD, 431/D003, Argonne, Illinois 60439, United States