1. Department of Pure and Applied Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153
2. Department of Chemistry, University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113
3. Institute for Solid State Physics, University of Tokyo, Roppongi 7-22-1, Minato, Tokyo 106
4. Department of Chemistry, Toho University, Funabashi, Chiba 274