1. Department of Applied Chemistry, School of Engineering; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8656 Japan
2. Rigaku Corporation; 3-9-12 Matsubara-cho, Akishima-shi Tokyo 196-8666 Japan
3. Present address: Division of Applied Chemistry; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan