1. Contribution from the Department of Chemistry, Bowdoin College, Brunswick, Maine 04011-8466, Department of Chemistry, 55 North Eagleville Road, University of Connecticut, Storrs, Connecticut 06269-3060, Department of Physics, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan, and “Light and Control” PRESTO/JST, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan