1. Contribution from the Department of Chemistry, Faculty of Science, Kyoto University, Kyoto 606, Japan, Institute for Laser Technology, Utsubo-Honmachi 1-8-4, Osaka 550, Japan, Department of Chemistry, Faculty of Engineering Science and Research Center for Extreme Materials, Osaka University, Toyonaka 560, Japan, Department of Chemical Process Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060, Japan, and Department of Chemistry, Faculty of Science, Osaka University, Toyonaka 560, Japan