1. Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
2. Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Naka-gun, Ibaraki 319-1195, Japan
3. Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tokai, Naka-gun, Ibaraki 319-1106, Japan
4. Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
5. RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan