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Decomposition of Benzene during Impacts in N-2-dominated Atmospheres
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SYSNO ASEP 0570785 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Decomposition 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, RIDArticle number 149 Source Title Astrophysical Journal - ISSN 0004-637X
Roč. 945, č. 2 (2023)Number of pages 10 s. Language eng - English Country GB - United Kingdom Keywords laboratory astrophysics ; infrared spectroscopy ; exoplanet atmospheres Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects GA21-11366S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFCH-W - RVO:61388955 UT WOS 000949236300001 EID SCOPUS 85150516507 DOI 10.3847/1538-4357/acbd48 Annotation Benzene 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. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2024 Electronic address https://hdl.handle.net/11104/0342126
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