1. Department of Chemistry and Biochemistry and Institute for Cellular and Molecular Biology, 1 University Station A5300, The University of Texas at Austin, Austin, Texas 78712-0156, Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland, and Department of Chemistry and Center for Ultrafast Optical Characteristics Control, Yonsei University, Seoul 120-749, Korea