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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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&apos;s main goal was to obtain the temperature dependence of the reaction rate coefficient and determine the reaction&apos;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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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&apos;s main goal was to obtain the temperature dependence of the reaction rate coefficient and determine the reaction&apos;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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GA20-22000S" target="_blank" >GA20-22000S: Reakce aniontu OH– v mezihvězdném prostředí, experimentální astrochemie</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

1538-4357

Svazek periodika

948

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

131

Kód UT WoS článku

000989747700001

EID výsledku v databázi Scopus

2-s2.0-85159792423