1. General Sekiyu K.K., 6-1, Ukishima-cho, Kawasaki-ku, Kawasaki 210-8526, Japan
2. Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuta-cho, Midori-ku, Yokohama 226-8502, Japan
3. Research Laboratory of Resources Utilization, Tokyo Institute of Technology, Nagatsuta-cho, Midori-ku, Yokohama 226−8503, Japan