Experimental study of the reaction of NO2- ions with CO2 molecules at temperatures and energies relevant to the Martian atmosphere
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Experimental study of the reaction of NO2- ions with CO2 molecules at temperatures and energies relevant to the Martian atmosphere
Original language description
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.
Czech name
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Czech description
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Classification
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
10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Result continuities
Project
<a href="/en/project/GA17-14200S" target="_blank" >GA17-14200S: Experimental and theoretical study of the chemical processes in the planetary atmospheres</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Icarus
ISSN
0019-1035
e-ISSN
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Volume of the periodical
335
Issue of the periodical within the volume
JAN 2020
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
113416
UT code for WoS article
000504802400048
EID of the result in the Scopus database
2-s2.0-85071865951