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PHOTODISSOCIATION SPECTROSCOPY AND DYNAMICS OF FREE RADICALS
Daniel M. Neumark
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Abstract
The photodissociation spectroscopy and dynamics of the vinoxy $(CH_{2}CHO), HCCO$, and CCO radicals have been studied by fast radical beam photo fragment translational spectroscopy. In this experiment, a fast ($6-8$ keV) beam of radicals is generated by laser photodetachment of a mass-selected anion beam. The radicals are photo dissociated with a second laser, and the neutral photo fragments are detected with high efficiency using a multichannel plate defector. Depending on the detector configuration, we can measure either the photo fragment yields as a function of energy, or the photofragment kinetic energy and angular distributions al selected dissociation energies. The three species to be discussed here all undergo predissociation and have highly structured photo fragment yield spectra. However, the energy and angular distributions show that the dissociation dynamics differ significantly.