1. Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo Meguro‐ku, Tokyo 153‐8902, Japan, Fax: +81‐3‐5454‐6998, http://maildbs.c.u‐tokyo.ac.jp/~smurata/index‐en.html
2. Department of Chemistry and Center for Photochemical Sciences, Bowling Green State University Bowling Green, OH 43403, USA