1. Laboratory of Advanced Materials Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 P. R. China
2. State Key Laboratory of Precision Spectroscopy School of Physics and Electronic Science East China Normal University 500 N. Dongchuan Road Shanghai 200241 P. R. China
3. Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 P. R. China
4. Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
5. School of Chemistry Beihang University Beijing 100191 P. R. China
6. School of Chemistry and Chemical Engineering Huazhong University of Science and Technology (HUST) 1037 Luoyu Road Wuhan 430074 P. R. China