1. Corporate R & D Headquarters, Fuji Electric Co., Ltd., Tokyo 191-8502, Japan
2. Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
3. Photon Factory, Institute of Structure Materials Science, High Energy Accelerator Research Organization (KEK-PF), Oho 1-1, Tsukuba 305-0811, Japan
4. Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Yushima 1-5-45, Bunkyo-ku, Tokyo 113-8549, Japan