1. Department of Chemistry, Faculty of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
2. Hiroshima Research & Development Center, Mitsubishi Heavy Industries, Ltd., Kan-on-shin-machi, Nishi-ku, Hiroshima 733-8601, Japan
3. Plant Siting and Environmental, The Kansai Electric Power Co., Inc., Nakanoshima, Kita-ku, Osaka 530-8270, Japan