			15min:

LASER-INDUCED GRATING STUDIES OF THE PREDISSOCIATION DYNAMICS OF OClO.

JAMES S. KELLER, Department of Chemistry, Kenyon College, Gambier, OH 43022.

The multidimensional nature of OClO^ ast predissociation was studied using a double-resonant, nonlinear optical technique. A two-color variant of laser-induced grating spectroscopy was configured to investigate the influence of initial nuclear motion on the A leftarrow X state absorption spectrum of chlorine dioxide. Grating-forming beams tuned to a transition in the neighborhood of the origin band selectively ``tag'' a well-defined subset of ground state molecules so that their near-ultraviolet absorption spectrum can be viewed in isolation by the diffractive scattering of a third probe beam. Near ultraviolet spectra of the (1,0,0), (0,1,0) and (1,1,0) ground state levels were obtained. Analysis of these spectra indicate a mode-selective increase in the predissociation rate due to ground state vibrational motion.