1. Department of Physics, Faculty of Science and Technology, Sophia University, Chiyoda-ku, Kioicho 7-1, Tokyo 102
2. Institute of Space and Astronautical Science, Yoshinodai, Sagamihara-shi, Kanagawa 229
3. Department of Chemistry, Faculty of Science and Technology, Sophia University, Chiyoda-ku, Kioicho 7-1, Tokyo 102