Associative detachment reactions of negative ions with O3

Temperature dependence of the oxide ion/ozone reaction in the gas phase

“…These data indicate that reaction will proceed almost exclusively by charge transfer at high temperatures. Importantly, these data also suggest that the apparent discrepancy between branching fractions reported for 0.3 eV collision energies by Lifshitz et al [9] and those reported in the recent room temperature thermal investigation [8] as well as this work arises from differences in collision energies. We do not attach any significance to the fact that the beam result does not fall exactly on the fit to our data because the fit is empirical and the extrapolation is over an enormous temperature range.…”

“…These data are important for determining the role this reaction plays in the stratosphere, lower ionosphere and higher temperature hypersonic vehicle wake environments. These data also provide insights into the origin of discrepancies between results from low energy beam and room temperature flow tube experiments recently identified in the literature [8,9].…”

“…We determined that reactive detachment is at most a minor reaction channel over the 123-500 K temperature range while Lifshitz et al [9] found that this reaction channel constituted 60% of the reactive collisions at 0.3 eV collision energy. At higher energies (3-20 eV), Fedchak et al [16] report a smaller relative cross-section for reactive detachment as compared to charge transfer.…”

“…Solid circles (᭹) are from this thermal flow tube work and the solid line is an exponential fit to these data. Open square ( ) is from the low energy beam experiment of Lifshitz et al [9] and is located at an effective temperature corresponding to the collision energy reported. is an exponential fit to the data.…”

Photochemistry of Ions at D-region Altitudes of the Ionosphere: A Review

“…The total rate coefficient and branching fraction data were determined for the binary reaction of O -ions with O 3 at 123, 200, 296, 400, 500 K temperatures using the temperature variable selected ion flow tube technique (Van Doren et al 2005) and at 2,300 K temperature based on ion beam-collision chamber experiments (Lifshitz et al 1977). Relative uncertainty in ionic product branching fraction is 5 %, and the total O -?…”