1. Contribution from Osaka National Research Institute, AIST, 1-8-31, Midorigaoka, Ikeda, Osaka 563, Japan, Research Institute of Innovative Technology for the Earth, 9-2, Kizugawadai, Kizu-cho, Sorakugun, Kyoto 619-02, Japan, and Department of Chemistry, Kent State University, Kent, Ohio 44242