1. Institute of Multidisciplinary Research for Advanced Materials Tohoku University Katahira Sendai Miyagi 980‐8579 Japan
2. Japan Synchrotron Radiation Research Institute, SPring‐8 Koto, Sayo‐cho Sayo‐gun Hyogo 679‐5198 Japan
3. Research Institute of Electrochemical Energy National Institute of Advanced Industrial Science and Technology 1‐8‐31 Midorigaoka Ikeda Osaka 563‐8577 Japan
4. Research Center for Materials Science/Graduate School of Science/Institute for Advanced Science Nagoya University Furo Nagoya Aichi 464‐8602 Japan
5. RIKEN SPring–8 Center RIKEN Koto, Sayo–cho Sayo–gun Hyogo 679–5148 Japan
6. Graduate School of Human and Environmental Studies Kyoto University Nihonmatsu‐cho Yoshida Sakyo‐ku Kyoto 606‐8501 Japan