THE BRANCHING RATIOS OF V= 2 AND V= 1 CHANNELS OF $HF_{2}$ and HFHCl AFTER PHOTO-DISSOCIATION
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Date
1994
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Ohio State University
Abstract
We present the branching ratios for v = 2 and v = 1 levels of the HF fragment after photo dissociation of $N = v_{1}+v_{2} = 3$ bands of $(HF)_{2}$ and v=3 HF stretch of HFHCl. The molecular complexes are produced in super-sonic jets which are intracavity in a Ti:Sapphire ring laser to exploit the high power necessary for pumping weak overtone transitions. The HF submolecule at v = 3 has vibrational excitation which is $10^{4}$ $cm^{-1}$ in excess of the binding energy of the complex resulting in the rupture of the van-der-Waals bond, and the excess energy is distributed among the vibration-rotation-translational degrees of freedom of the fragments. The $\Delta v=1$ and $\Delta v=2$ emission from the HF fragment are then detected by large area PbS and Ge detectors, respectively. For the bands presently examined $v_{1} = 3, v_{2} = 0$ of $(HF)_{2}$ and the analogous band of HFHCl, the channel with the HF fragment in the v=2 level is the more dominant one, as expected from $\Delta v= -1$ propensity rules.
Description
Author Institution: Department of Chemistry, Harvard University; Department of Chemistry, Institute of Atomic and Molecular Science; Department of Chemistry, Aerodyne Research, Inc.