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Decomposition of Benzene during Impacts in N-2-dominated Atmospheres

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    SYSNO ASEP0570785
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleDecomposition of Benzene during Impacts in N-2-dominated Atmospheres
    Author(s) Petera, Lukáš (UFCH-W) ORCID
    Knížek, Antonín (UFCH-W) ORCID, RID, SAI
    Laitl, Vojtěch (UFCH-W) ORCID
    Ferus, Martin (UFCH-W) ORCID, RID
    Article number149
    Source TitleAstrophysical Journal - ISSN 0004-637X
    Roč. 945, č. 2 (2023)
    Number of pages10 s.
    Languageeng - English
    CountryGB - United Kingdom
    Keywordslaboratory astrophysics ; infrared spectroscopy ; exoplanet atmospheres
    Subject RIVCF - Physical ; Theoretical Chemistry
    OECD categoryPhysical chemistry
    R&D ProjectsGA21-11366S GA ČR - Czech Science Foundation (CSF)
    Method of publishingOpen access
    Institutional supportUFCH-W - RVO:61388955
    UT WOS000949236300001
    EID SCOPUS85150516507
    DOI10.3847/1538-4357/acbd48
    AnnotationBenzene is a simple neutral aromatic compound found in molecular clouds, comets, and planetary atmospheres. It has been confirmed on Jupiter, Saturn, Titan, and is expected on exoplanets. In this paper, the decomposition of benzene in a simulated asteroid or comet impact into an N-2-dominated atmosphere was investigated. The impact plasma was simulated with laser-induced dielectric breakdown and the gas phase decomposition products were observed using high-resolution Fourier transform infrared spectroscopy. The gas phase decomposition products involve mainly HCN, C2H2, and smaller amounts of CH4 with yields of 3.1%-24.0%, 0-11.7%, and 0.5%-3.3%, respectively. Furthermore, in presence of water, benzene also produces CO and CO2 with yields of 2.4%-35.1% and 0.01%-4.8%, respectively. The oxidation state of the product mixture is proportional to the water content. Apart from that, a black-brownish solid phase is formed during the experiments, which makes up about 60% of the original carbon content. Our results therefore show that in anoxic N-2-dominated planetary atmospheres, impacts might lead to the depletion of benzene and the formation of HCN, C2H2, and CH4 and, in the presence of water, to the formation of CO and CO2.
    WorkplaceJ. Heyrovsky Institute of Physical Chemistry
    ContactMichaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196
    Year of Publishing2024
    Electronic addresshttps://hdl.handle.net/11104/0342126
Number of the records: 1  

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