1. Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Educationand the College of Chemistry and Materials Science of Northwest University Xi'an 710069 P. R. China
2. Hefei National Laboratory of Physical Sciences at the MicroscaleSchool of Chemistry of Materials SciencesSynergetic Innovation of Quantum Information & Quantum TechnologyCAS Key Lab of Materials for Energy Conversion, and CAS Excellent Center in NanoscienceUniversity of Science and Technology of China Hefei 230026 P. R. China
3. Department of Chemical EngineeringUCL Torrington Place London WC1E 7JE UK
4. Shanghai Synchrotron Radiation FacilityShanghai Institute of Applied PhysicsChinese Academy of Science Shanghai 201800 P. R. China
5. National Synchrotron Radiation LaboratoryUniversity of Science and Technology of China Hefei 230029 P. R. China
6. Institute of PhysicsChinese Academy of Sciences Beijing 100190 P. R. China