1. College of Polymer Science and
Engineering, Sichuan University, Chengdu
610065, China
2. Institute
for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011, Japan
3. Japan Synchrotron Radiation Research Institute, Sayo-gun, Hyogo-ken 679-5198,
Japan
4. High Energy Accelerator Research Organization, Tokai, Ibaraki-ken 319-1106,
Japan