1. Department
of Chemistry, Stanford University, Stanford, California 94305, United States
2. PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
3. Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
4. Center for High Pressure Science & Technology Advanced Research, Pudong, Shanghai 201203, P. R. China
5. Department
of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States