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Variable Temperature Rate Studies for the Reaction H3O+ + (C2H2)2 Measured with a Coaxial Molecular Beam Radio Frequency Ring Electrode Ion Trap

The independent molecule and ion temperature dependence of the rate coefficient for the H3O+ and (C2H2)2 reaction producing C2H5O+ are determined using a coaxial molecular beam radio frequency ring electrode ion trap (CoMB-RET). The H3O+ temperature is varied from 25 to 170 K, while the equilibrated C2H2/(C2H2)2 beam temperatures sampled are 160, 180, 200, and 220 K. The rate coefficient of the H3O+ + (C2H2)2 reaction is determined to be 4.0 × 10–10 × (Treact/300)−2.5 in the reaction temperature range of Treact = 114–187 K. The H3O+ and C2H2 radiative association reaction is found to have a rate coefficient below 1 × 10–13 cm3·s–1 at 187 K. This result is consistent with Herbst’s experimental determination.

Authors:   Mark A. Smith; Bing Yuan; Andrei Sanov
Journal:   Journal of Physical Chemistry A
Year:   2012
DOI:   10.1021/jp305936f
Publication date:   18-Sep-2012
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