RECOIL VELOCITY DISTRIBUTIONS OF PHOTOFRAGMENTS FROM CF, $I^{+}$ AND $CF_{3}I$
Loading...
Date
1992
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The ultraviolet photodissociation of CF$\gamma I^{+} \tilde{X}^{2} E_\alpha{^z}$ produced by resonant (2+1) multiphoton ionization has been studied by measuring ion fragment arrival time profiles in a time-of-flight mass spectrometer. We show how fragment recoil energy distribution and anisotropy can be extracted from these measurements. The energetic and anisotropic $I^{+}$ fragments observed are shown to be the photoproducts from single-photon dissociation of $CF_{3}I^{+}$. The $CF_{3}{^{4}}$ fragments are produced by a combination of statistical dissociation of parent $CF_{3}I^{+}$ and the same ion dissociation process that leads to $I^{+}$. The current understanding of $CF_{3}I^{+}$ cannot explain the predominantly parallel absorption dipole and prompt dissociation observed in these studies. Neutral $CF_{3}I$ has also been photolyzed in the red wing of the A dissociation continuum. $I(^{2}P_{1/2}$) and $I^{-}$ ($^{2}P_{1/2}$) translational energies and recoil anisotropies have been determined. Our new results will be discussed in the context of photofragmentation studies at shorter wavelenghts.
Description
Author Institution: Department of Chemistry, University of Cincinnati