1. Department of Chemistry, Faculty of Science, Ochanomizu University, Ohtsuka, Bunkyo-ku, Tokyo 112-8610, Japan, Physical Chemistry Laboratory, Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan, and Synchrotron Radiation Research Center, Japan Atomic Energy Agency, 1-1-1, Koto, Sayo-cho, Hyogo 679-5148, Japan