Ion trap study of the isotope exchange in the low-temperature collisions of OD^- anions with HD

Abstract

The rate coefficients k₁ and k₂ of the reaction ${\text{OD}}^{-}+\text{HD}\underset{k_2}{\overset{k_1}{\rightleftarrows }}{\text{OH}}^{-}+{\text{D}}_2$ in the forward and reverse direction were measured in the temperature ranges of 15 K–273 K and 95 K–300 K, respectively. The experiments were carried out in a temperature-variable cryogenic linear 22-pole radio-frequency ion trap instrument. The temperature dependence of the equilibrium constant $K_{\mathrm{e}\mathrm{q}12}\left(T\right)$ obtained from the measured data is in good agreement with the value calculated using the detailed balance principle under the Born-Oppenheimer approximation. The enthalpy and the entropy of the reaction obtained from the linear Van't Hoff equation are $\mathrm{\Delta }H=(20\pm 2\pm 3^{\mathrm{s}\mathrm{y}\mathrm{s}})\mathrm{m}\mathrm{e}\mathrm{V}$ and $\mathrm{\Delta }S=(5.9\pm 1.8\pm {1.4}^{\mathrm{s}\mathrm{y}\mathrm{s}})\mathrm{J}/\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{K}$, respectively.

GRAPHICAL ABSTRACT

Keywords:

• Deuterium
• isotope exchange
• hydroxyl anion
• ion trap
• enthalpy of reaction

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Correction

Acknowledgments

We thank the Technische Universität Chemnitz and the Deutsche Forschungsgemeinschaft for lending the 22-pole trap to Charles University.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article was originally published with errors, which have now been corrected in the online version. Please see Correction (http://doi.org/10.1080/00268976.2023.2236448)

Additional information

Funding

This work was supported by the Czech Science Foundation under Grants 20-22000S and 21-28560S; and the Charles University Grant Agency under Grants 1162920 and 376721.