1. Department of Chemistry and
Chemical Biology, Cornell University, Ithaca,
New York 14853, United States
2. Department of Molecular Biology
and Biochemistry, University of California, Irvine, California 92697, United States
3. Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California
94025, United States
4. Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36,
D-45470 Mülheim an der Ruhr, Germany