1. Johns Hopkins University, Baltimore, Maryland 21218, United States
2. Department
of Chemistry, Stanford University, Stanford, California 94305, United States
3. Stanford
Synchrotron Radiation Lightsource, SLAC, Stanford University, Stanford, California 94305, United States
4. Department
of Material and Life Science, Graduate School of Engineering, Osaka University, and ALCA, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan