1. Chemical Science and Technology Division (CST-9), Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (V. M.); Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712 (J. A. H.); Department of Chemistry and Physics, Western Carolina University, Cullowhee, North Carolina 28723 (K. G. V., D. J. B.); and Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506 (J. D. R.)