1. Departments of Urban & Environmental Engineering and of Molecular Engineering, Graduate School of Engineering, Kyoto University, Yoshidahon-machi, Sakyo-ku, Kyoto 606-8501, Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, and Japan Synchrotron Radiation Institute (JASRI), 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan