1. Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan, Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, and Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 minami-Osawa, Hachioji, 192-0397, Japan