1. Beijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesLaboratory of Polymer Physics and ChemistryInstitute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
2. School of Chemical SciencesUniversity of Chinese Academy of Sciences Beijing 100049 P. R. China
3. Molecular Reaction Dynamics LaboratoryInstitute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
4. Key Laboratory of Advanced Technologies of Materials (Ministry of Education)Southwest Jiaotong University Chengdu 610031 P. R. China
5. Department of Physics and AstronomyMcMaster University Hamilton Ontario L8S 4M1 Canada
6. Center for Physicochemical Analysis and MeasurementInstitute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China