1. Department of ChemistryTsinghua University Beijing 100084 China
2. School of Physical SciencesUniversity of Chinese Academy of Sciences Beijing 100190 China
3. Beijing Synchrotron Radiation FacilityInstitute of High Energy PhysicsChinese Academy of Sciences Beijing 100049 China
4. National Synchrotron Radiation Laboratory (NSRL)University of Science and Technology of China Hefei Anhui 230029 China
5. State Key Lab of Organic–Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical Technology Beijing 100029 China