1. Department of Applied Chemistry; Graduate School of Engineering; Osaka Prefecture University; 1-1 Gakuen-cho, Naka-ku Sakai Osaka 599-8531 Japan
2. The Research Institute for Molecular Electronic Devices (RIMED); Osaka Prefecture University; 1-1 Gakuen-cho, Naka-ku Sakai Osaka 599-8531 Japan
3. Rigaku Corporation; 3-9-12 Matsubara-cho Akishima Tokyo 196-8666 Japan