1. Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama 223-8522, Japan, Special Research Laboratory for Optical Science, Kanagawa Academy of Science and Technology, KSP Building East 412, 3-2-1 Sakado, Takatsu-ku, Kawasaki 213-0012, Japan, and Faculty of Chemistry and Chemical Engineering, Heilongjiang University, Harbin 150080, P. R. China