Isotope Exchange Reaction of OH- Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10468396" target="_blank" >RIV/00216208:11320/23:10468396 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Ng0n.ae-Q_" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Ng0n.ae-Q_</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-4357/acc9ac" target="_blank" >10.3847/1538-4357/acc9ac</a>

Result language
angličtina
Original language name
Isotope Exchange Reaction of OH- Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study
Original language description
This paper presents the results of an experimental study of the reaction of OH- anions with HD molecules leading to the formation of OD- anions. The study's main goal was to obtain the temperature dependence of the reaction rate coefficient and determine the reaction's enthalpy. This study was carried out at astrophysically relevant temperatures from 15 to 300 K. The reaction was studied using a temperature-variable cryogenic linear 22-pole radio-frequency ion trap. The rotational temperature of the OH- anions in the ion trap was characterized by near-threshold photodetachment spectroscopy. At 15 K, the measured reaction rate coefficient is 5 x 10(-10) cm(3) s(-1). With increasing temperature, the reaction rate coefficient decreases monotonically to 5 x 10(-11) cm(3) s(-1) at 300 K. Comparing with the previously determined rate coefficient of the reverse reaction of OD- anions with H-2, we obtained the temperature dependence of the equilibrium constant. The enthalpy and entropy of the title reaction were determined in the studied temperature range as Delta H = (-23.9 +/- 0.7 +/- 2.6(sys)) meV and Delta S = (-8.5 +/- 1.2 +/- 1.4(sys)) J mol(-1) K-1, respectively.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Project
<a href="/en/project/GA20-22000S" target="_blank" >GA20-22000S: Reactions of hydroxyl anion OH– in interstellar medium, experimental astrochemistry</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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