1. Departments of Chemistry and Physics, University of California, One Shields Avenue, Davis, California 95616, Department of Chemistry, Ewha Womans University, Seoul, Korea, 120-750, Institute of Physics, B5, University of Liège, B-4000 Sart-Tilman, Belgium, Department of Chemistry, University of MissouriRolla, Rolla, Missouri 65409-0010, and Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824