1. Kanagawa Academy of Science and Technology, 1583 Iiyama, Atsugi, Kanagawa 243-02, Japan, Department of Applied Chemistry, Faculty of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan, Research Center for Advanced Science and Technology, University of Tokyo, Komaba, Meguro-Ku, Tokyo 153, Japan