1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
2. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
4. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
5. University of Science and Technology of China, National Synchrotron Radiation Laboratory, Hefei 230029, China