1. Department of Chemical and Biological Sciences, Faculty of Science Japan Women's University 2‐8‐1 Mejirodai, Bunkyo Tokyo 112‐8681 Japan
2. Japan Synchrotron Radiation Research Institute (JASRI/SPring‐8) 1‐1‐1 Kouto Sayo Hyogo 679‐5198 Japan
3. Institute for Solid State Physics University of Tokyo Kashiwa Chiba 277‐8581 Japan
4. Graduate School of Engineering Nagoya Institute of Technology Nagoya 466‐8555 Japan