1. Department of Chemistry, Stanford University, 380 Roth Way, Stanford, California 94305, United States
2. Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, Minnesota 55391, United States
3. Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan
4. Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan
5. Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka 590-0494, Japan
6. RIKEN SPring-8 Center, RIKEN, Sayo, Hyogo 679-5148, Japan
7. SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States