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Experimental study of the reaction of NO2- ions with CO2 molecules at temperatures and energies relevant to the Martian atmosphere

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F20%3A00511876" target="_blank" >RIV/61388955:_____/20:00511876 - isvavai.cz</a>

  • Výsledek na webu

    <a href="http://hdl.handle.net/11104/0302120" target="_blank" >http://hdl.handle.net/11104/0302120</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.icarus.2019.113416" target="_blank" >10.1016/j.icarus.2019.113416</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Experimental study of the reaction of NO2- ions with CO2 molecules at temperatures and energies relevant to the Martian atmosphere

  • Popis výsledku v původním jazyce

    Comprehensive theoretical models of the Martian ionosphere require reliable kinetic data for ion – molecule reactions over a wide range of temperatures. In situ measurements of the negative ions have not yet been performed and so ion chemical modelling is relied upon, which indicate that nitrite anions, NO2−, are important. Thus, in the present work the gas phase reaction of NO2− with carbon dioxide molecules, CO2, has been studied at the temperatures and energies relevant to the Martian atmosphere. The rate coefficient was measured over the temperature range 220 ± 2 K to 334 ± 2 K using a variable temperature selected ion flow tube (VT-SIFT) instrument. Additionally, a commercial Tandem Quadrupole Mass Spectrometer (TQMS) has been exploited to explore the reaction occurring during NO2−/CO2 collisions over the centre-of-mass energies from near-thermal to 6 eV. Two different channels of the reaction were studied. Under the thermal conditions of the VT-SIFT, the reaction is seen to proceed slowly via ternary association ultimately producing CO3– ions, the measured effective ternary rate coefficient in helium being k3 = (3.8 ± 1.5) × 10−30 cm6 s−1 at 220 ± 2 K and k3 = (0.5 ± 0.2) × 10−30 cm6 s−1 at 334 ± 2 K. The effective ternary rate coefficient can be greater in the Martian atmosphere where CO2 is the stabilizing gas. In the TQMS experiment, CO3– production occurs via a binary reaction above a threshold energy of 1.8 ± 0.2 eV. These experimental data can be used to refine the existing ion-chemical models of the Martian atmosphere.

  • Název v anglickém jazyce

    Experimental study of the reaction of NO2- ions with CO2 molecules at temperatures and energies relevant to the Martian atmosphere

  • Popis výsledku anglicky

    Comprehensive theoretical models of the Martian ionosphere require reliable kinetic data for ion – molecule reactions over a wide range of temperatures. In situ measurements of the negative ions have not yet been performed and so ion chemical modelling is relied upon, which indicate that nitrite anions, NO2−, are important. Thus, in the present work the gas phase reaction of NO2− with carbon dioxide molecules, CO2, has been studied at the temperatures and energies relevant to the Martian atmosphere. The rate coefficient was measured over the temperature range 220 ± 2 K to 334 ± 2 K using a variable temperature selected ion flow tube (VT-SIFT) instrument. Additionally, a commercial Tandem Quadrupole Mass Spectrometer (TQMS) has been exploited to explore the reaction occurring during NO2−/CO2 collisions over the centre-of-mass energies from near-thermal to 6 eV. Two different channels of the reaction were studied. Under the thermal conditions of the VT-SIFT, the reaction is seen to proceed slowly via ternary association ultimately producing CO3– ions, the measured effective ternary rate coefficient in helium being k3 = (3.8 ± 1.5) × 10−30 cm6 s−1 at 220 ± 2 K and k3 = (0.5 ± 0.2) × 10−30 cm6 s−1 at 334 ± 2 K. The effective ternary rate coefficient can be greater in the Martian atmosphere where CO2 is the stabilizing gas. In the TQMS experiment, CO3– production occurs via a binary reaction above a threshold energy of 1.8 ± 0.2 eV. These experimental data can be used to refine the existing ion-chemical models of the Martian atmosphere.

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Návaznosti výsledku

  • Projekt

    <a href="/cs/project/GA17-14200S" target="_blank" >GA17-14200S: Experimentální a teoretické studium chemických procesů v atmosférách planet</a><br>

  • Návaznosti

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Ostatní

  • Rok uplatnění

    2020

  • Kód důvěrnosti údajů

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

Údaje specifické pro druh výsledku

  • Název periodika

    Icarus

  • ISSN

    0019-1035

  • e-ISSN

  • Svazek periodika

    335

  • Číslo periodika v rámci svazku

    JAN 2020

  • Stát vydavatele periodika

    US - Spojené státy americké

  • Počet stran výsledku

    6

  • Strana od-do

    113416

  • Kód UT WoS článku

    000504802400048

  • EID výsledku v databázi Scopus

    2-s2.0-85071865951