1. Department of Chemistry, Saitama University, Shimo-Okubo 255, Sakura-ku, Saitama City, Saitama 338-8570, Japan
2. Department
of Mechanical Science and Bioengineering, Graduate School of Engineering
Science, Osaka University, 1-3 Machikaneyama-cho,
Toyonaka, Osaka 560-851, Japan
3. Center for Computational
Science and E-systems, Japan Atomic Energy Agency, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa City,
Chiba 277-8563, Japan