1. Department
of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1
Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
2. Chemical
Science and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
3. JST-ERATO, Nakajima Designer
Nanocluster Assembly Project, 3-2-1
Sakado, Takatsu-ku, Kawasaki 213-0012, Japan