Possible Hydrocarbon Chemical Growth Routes from l-C<sub>3</sub>H<sup>+</sup> in Dense Molecular Clouds

The C3H+ cation plays a pivotal role within the chemical network of dense interstellar clouds. Its relatively slow reaction with molecular hydrogen (H2) suggests that reactions with other species, particularly small hydrocarbons, may play a significant role. In this study, we measured the absolute reaction cross sections of C3H+ with acetylene (C2H2) and the two isomers of C3H4 (allene and propyne). To facilitate the implementation of our experimental data into astrochemical models, we converted the reaction cross sections into rate constants. No temperature dependency was observed for all of the investigated channels. The reaction rates for C3H+ with C2H2 and C3H4, yielding C5H2+ and C4H3+, respectively, are in good agreement with existing data. However, we report a previously unidentified channel in the reaction with C3H4, leading to protonated acetylene C2H3+ with a 30% yield compared to the major product, C4H3+.

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Publication Details

Journal
ACS Earth and Space Chemistry
Published
2025-01-10
DOI
https://doi.org/10.1021/acsearthspacechem.4c00323
Primary Topic
Atmospheric Ozone and Climate
Type
article
Field-Weighted Citation Impact
0.00

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article

Possible Hydrocarbon Chemical Growth Routes from l-C3H+ in Dense Molecular Clouds

Christian Alcaraz, Jean‐Christophe Loison, R. Thissen, Nicolas Solem et al.
ACS Earth and Space Chemistry
Atmospheric Ozone and Climate
article

Possible Hydrocarbon Chemical Growth Routes from l-C3H+ in Dense Molecular Clouds

Christian Alcaraz, Jean‐Christophe Loison, R. Thissen, Nicolas Solem, Ugo Jacovella, Giel Muller, Corentin Rossi, Claire Romanzin
article en

Abstract

The C3H+ cation plays a pivotal role within the chemical network of dense interstellar clouds. Its relatively slow reaction with molecular hydrogen (H2) suggests that reactions with other species, particularly small hydrocarbons, may play a significant role. In this study, we measured the absolute reaction cross sections of C3H+ with acetylene (C2H2) and the two isomers of C3H4 (allene and propyne). To facilitate the implementation of our experimental data into astrochemical models, we converted the reaction cross sections into rate constants. No temperature dependency was observed for all of the investigated channels. The reaction rates for C3H+ with C2H2 and C3H4, yielding C5H2+ and C4H3+, respectively, are in good agreement with existing data. However, we report a previously unidentified channel in the reaction with C3H4, leading to protonated acetylene C2H3+ with a 30% yield compared to the major product, C4H3+.

ACS Earth and Space ChemistryVol. 9(2)
Centre National de la Recherche Scientifique (FR), Université de Bordeaux (FR), University of Wollongong (AU), Université Paris-Saclay (FR), Synchrotron soleil (FR), Institut des Sciences Moléculaires (FR), Laboratoire de Chimie Physique (FR), Sustainable Horizons Institute (US), Institut des Sciences Moléculaires d'Orsay (FR), Institut de Chimie (FR), Institut des Sciences Moléculaires de Marseille (FR), Centre Émile Durkheim (FR)
Agence Nationale de la Recherche, Laboratoire d’excellence Physique Atomes Lumière Matière
Openalex Percentile: Top 100%
Atmospheric Ozone and Climate
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