Isotope Exchange Reaction of OH− Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study
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 c...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acc9ac |
| _version_ | 1797695033629999104 |
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| author | Radek Plašil Liliia Uvarova Serhiy Rednyk Štěpán Roučka Erik Vanko Petr Dohnal Juraj Glosík |
| author_facet | Radek Plašil Liliia Uvarova Serhiy Rednyk Štěpán Roučka Erik Vanko Petr Dohnal Juraj Glosík |
| author_sort | Radek Plašil |
| collection | DOAJ |
| 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 × 10 ^−10 cm ^3 s ^−1 . With increasing temperature, the reaction rate coefficient decreases monotonically to 5 × 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 Δ H = (−23.9 ± 0.7 ± 2.6 ^sys ) meV and Δ S = (−8.5 ± 1.2 ± 1.4 ^sys ) J mol ^−1 K ^−1 , respectively. |
| first_indexed | 2024-03-12T03:06:25Z |
| format | Article |
| id | doaj.art-b745a95215054771a02c2ef464e4dcb5 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T03:06:25Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-b745a95215054771a02c2ef464e4dcb52023-09-03T14:32:51ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01948213110.3847/1538-4357/acc9acIsotope Exchange Reaction of OH− Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap StudyRadek Plašil0https://orcid.org/0000-0001-8520-8983Liliia Uvarova1https://orcid.org/0000-0003-1448-0642Serhiy Rednyk2https://orcid.org/0000-0002-0408-0170Štěpán Roučka3https://orcid.org/0000-0002-2419-946XErik Vanko4https://orcid.org/0000-0001-6652-0066Petr Dohnal5https://orcid.org/0000-0003-0341-0382Juraj Glosík6https://orcid.org/0000-0002-2638-9435Charles University , Faculty of Mathematics and Physics, Department of Surface and Plasma Science, V Holešovičkách 2, 180 00 Prague, Czech Republic ; radek.plasil@mff.cuni.czCharles University , Faculty of Mathematics and Physics, Department of Surface and Plasma Science, V Holešovičkách 2, 180 00 Prague, Czech Republic ; radek.plasil@mff.cuni.czCharles University , Faculty of Mathematics and Physics, Department of Surface and Plasma Science, V Holešovičkách 2, 180 00 Prague, Czech Republic ; radek.plasil@mff.cuni.czCharles University , Faculty of Mathematics and Physics, Department of Surface and Plasma Science, V Holešovičkách 2, 180 00 Prague, Czech Republic ; radek.plasil@mff.cuni.czCharles University , Faculty of Mathematics and Physics, Department of Surface and Plasma Science, V Holešovičkách 2, 180 00 Prague, Czech Republic ; radek.plasil@mff.cuni.czCharles University , Faculty of Mathematics and Physics, Department of Surface and Plasma Science, V Holešovičkách 2, 180 00 Prague, Czech Republic ; radek.plasil@mff.cuni.czCharles University , Faculty of Mathematics and Physics, Department of Surface and Plasma Science, V Holešovičkách 2, 180 00 Prague, Czech Republic ; radek.plasil@mff.cuni.czThis 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 × 10 ^−10 cm ^3 s ^−1 . With increasing temperature, the reaction rate coefficient decreases monotonically to 5 × 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 Δ H = (−23.9 ± 0.7 ± 2.6 ^sys ) meV and Δ S = (−8.5 ± 1.2 ± 1.4 ^sys ) J mol ^−1 K ^−1 , respectively.https://doi.org/10.3847/1538-4357/acc9acAstrochemistryInterstellar moleculesIsotopic abundancesLaboratory astrophysicsReaction rates |
| spellingShingle | Radek Plašil Liliia Uvarova Serhiy Rednyk Štěpán Roučka Erik Vanko Petr Dohnal Juraj Glosík Isotope Exchange Reaction of OH− Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study The Astrophysical Journal Astrochemistry Interstellar molecules Isotopic abundances Laboratory astrophysics Reaction rates |
| title | Isotope Exchange Reaction of OH− Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study |
| title_full | Isotope Exchange Reaction of OH− Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study |
| title_fullStr | Isotope Exchange Reaction of OH− Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study |
| title_full_unstemmed | Isotope Exchange Reaction of OH− Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study |
| title_short | Isotope Exchange Reaction of OH− Anion with HD at Temperatures from 15 K up to 300 K: Ion Trap Study |
| title_sort | isotope exchange reaction of oh anion with hd at temperatures from 15 k up to 300 k ion trap study |
| topic | Astrochemistry Interstellar molecules Isotopic abundances Laboratory astrophysics Reaction rates |
| url | https://doi.org/10.3847/1538-4357/acc9ac |
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