1. Kanagawa Academy of Science and Technology, KAST Laboratory, 1583 Iiyama, Atsugi, Kanagawa 243-02, Japan, Research Center for Advanced Science and Technology, University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 153, Japan, and Department of Applied Chemistry, Faculty of Engineering, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113, Japan