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