1. Department of Chemistry, University of Incheon, 177 Dohwa-dong, Nam-ku, Incheon, 402-749, South Korea
2. Department of Chemistry, University of Virginia, P.O. Box 400319, Charlottesville, Virginia 22904-4319
3. Laboratoire de Physique Quantique, UMR 5626, IRSAMC, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse Cedex 4, France