1. a Department of Chemistry, Faculty of Education , Yamaguchi University , Yoshida, Yamaguchi, 753, Japan
2. b Cray Research Japan Ltd. , 13-3 Ichiban-cho, Chiyoda-ku, Tokyo, 102, Japan
3. c Department of Applied Chemistry , Nagoya Institute of Technology , Gokiso-cho, Showa-ku, Nagoya, 466, Japan