1. Photodynamics Research Center, The Institute of Physical and Chemical Research (RIKEN), 519-1399 Aoba, Aramaki, Aoba-ku, Sendai 980-0845, Japan, Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan, and Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan