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Communication: Transfer ionization in a thermal reaction of a cation and anion: Ar+ with Br and I
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Figures

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FIG. 1.

Cation abundances relative to Ar+ 7.1 ms after addition of either CFBr (circles), CCl (squares), or CFI (triangles) to the afterglow at 300 K and 2 Torr. The solid line fit to Br+ is the best fit model reflecting k = 1.9 × 10−9 cm3 s−1. The dashed line fit to Cl+ is the model fit assuming Cl+ production via TI; the solid line is the model fit assuming Cl+ production by charge transfer from He+. The solid line fit to I+ is the best fit model reflecting k = 1.1 × 10−9 cm3 s−1; dashed lines are the modeled contributions to that fit from TI and from dissociative charge transfer with Ar+.

Image of FIG. 2.

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FIG. 2.

Measured TI rate coefficients for the indicated reactions as a function of temperature.

Tables

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Table I.

Exoergicities and measured rate coefficients for TI at the indicated temperatures.

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/content/aip/journal/jcp/139/17/10.1063/1.4828455
2013-11-01
2014-04-21

Abstract

We present experimental evidence that reactions of argon cations Ar+ with the halogen anions Br and I do not occur exclusively by mutual neutralization, but also produce the cations Br+ or I+ ions by transfer ionization (TI). The experiments were carried out in flowing-afterglow plasmas at gas temperatures between and 300 and 500 K, and employed a variant of the Variable Electron and Neutral Density Attachment Mass Spectrometry method. The measured TI rate coefficients are 1.9 ± 0.6 × 10−9 cm3 s−1 and × 10−9 cm3 s−1 for the Br and I reactions, respectively. We find that the TI rate coefficients decline with temperature as T−0.5 to T−1. No indication of TI was found in the reaction with Cl, where it is endoergic.

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Scitation: Communication: Transfer ionization in a thermal reaction of a cation and anion: Ar+ with Br− and I−
http://aip.metastore.ingenta.com/content/aip/journal/jcp/139/17/10.1063/1.4828455
10.1063/1.4828455
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