1. Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, University of Fukui, Fukui 910-8507, Japan, Chemical Research Center, Hungarian Academy of Sciences, H-1025 Budapest, P.O. Box 17, Hungary, Department of Applied Physics, Graduate School of Engineering, University of Fukui, Fukui 910-8507, Japan, and Department of Computational Molecular Science, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan