1. Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, United States
2. Department of Chemical Engineering, University of California, Santa Barbara, California 93106-5080, United States
3. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
4. Department of Physics, University of Washington, Seattle, Washington 98195, United States