1. Department of Chemistry, Faculty of Science, Okayama University, 3-1-1 Tsushima, Okayama 700-8530, Japan, Department of Chemistry, Faculty of Science, Okayama University of Science, 1-1 Ridaicho, Okayama 700-0005, Japan, Department of Chemistry, Faculty of Science, Fukuoka University, 1-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan, and Laboratoire Leon Brillouin, CE Saclay, 91191 Gif-sur-Yvette Cedex, France