1. State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin University Changchun 130012 P. R. China
2. Stanford Synchrotron Radiation LightsourceSLAC National Accelerator LaboratoryStanford University Menlo Park CA 94025 USA
3. National Synchrotron Radiation LaboratoryUniversity of Science and Technology of China Hefei Anhui 230029 P. R. China
4. School of Physical and Mathematical SciencesNanyang Technological University Singapore 637371 Singapore