1. Keio
Institute of Pure and Applied Science (KiPAS), Keio University, 3-14-1
Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
2. Nakajima
Designer Nanocluster Assembly Project, ERATO, Japan Science and Technology Agency (JST), 3-2-1 Sakado, Takatsu-ku, Kawasaki 213-0012, Japan
3. Department
of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1
Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan