CN radical hydrogenation from solid H2 reactions, an alternative way of HCN formation in the interstellar medium
| Autor: | Patrice Theulé, Vassilissa Vinogradoff, Thierry Chiavassa, S. A. H. Müller, Wolfram Sander, Fabien Borget, Dirk Grote |
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| Přispěvatelé: | Physique des interactions ioniques et moléculaires (PIIM), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Lehrstuhl für Organische Chemie II, Ruhr-Universität Bochum [Bochum], Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), This work has been funded by the French National Program 'Physique et Chimie du Milieu Interstellaire' (PCMI) and by the CNES (Centre National dÉtudes Spatiales) agency. This work was supported by the Cluster of Excellence RESOLV (EXC 1069) funded by the Deutsche Forschungsgemeinschaft (DFG). |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Astrochemistry [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] Radical Photodissociation Astronomy and Astrophysics Context (language use) Astrophysics 010402 general chemistry Photochemistry 01 natural sciences 0104 chemical sciences [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry chemistry.chemical_compound Monomer chemistry Space and Planetary Science 0103 physical sciences Molecule Reactivity (chemistry) Fourier transform infrared spectroscopy 010303 astronomy & astrophysics |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 598, pp.A22. ⟨10.1051/0004-6361/201526383⟩ Astronomy and Astrophysics-A&A, 2017, 598, pp.A22. ⟨10.1051/0004-6361/201526383⟩ |
| ISSN: | 0004-6361 |
| DOI: | 10.1051/0004-6361/201526383⟩ |
| Popis: | Context. Molecular hydrogen (H2) is the most abundant molecule of the interstellar medium (ISM) in gas phase and it has been assumed to exist in solid state or as coating on grains. Aims. Our goal is to show that solid H2 can act as a hydrogenation agent, reacting with CN radicals to form HCN. Methods. In a H2 matrix, we studied the hydrogenation of the CN radical generated from the vacuum ultraviolet photolysis (VUV-photolysis) of C2N2 at 3.8 K. We modified the wavelengths and the host gas in order to be sure that CN radicals can abstract H from H2 molecules. Results. HCN monomers, dimers, and oligomers have been characterised by Fourier transform infrared spectroscopy (FTIR). H2CN as well as CN radicals have also been clearly observed during the photolysis performed at 3.8 K. Conclusions. H2 is a hydrogenation reagent towards CN radicals producing HCN. This type of reaction should be taken into account for the reactivity at low temperature in contaminated H2 ice macro-particles (CHIMPs), H2 flakes or in the first sublayers of grains where solid H2 has accumulated. |
| Databáze: | OpenAIRE |
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