| Title |
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Diffusive Hydrogenation Reactions of CO Embedded in Amorphous Solid Water at Elevated Temperatures ∼70 K
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| Creator |
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| Accessrights |
open access |
| Rights |
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This is the Accepted Manuscript version of an article accepted for publication in Astrophysical journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.3847/1538-4357/abab9b.
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| Subject |
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Other
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Astrochemistry
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Other
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Molecular clouds
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Other
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Dense interstellar clouds
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Other
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Interstellar molecules
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Other
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Interstellar dust
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Other
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Laboratory astrophysics
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NDC
420
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| Description |
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Abstract
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The surface processes on interstellar dust grains have an important role in the chemical evolution in molecular clouds. Hydrogenation reactions on ice surfaces have been extensively investigated and are known to proceed at low temperatures mostly below 20 K. In contrast, information about the chemical processes of molecules within an ice mantle is lacking. In this work, we investigated diffusive hydrogenation reactions of carbon monoxide (CO) embedded in amorphous solid water (ASW) as a model case and discovered that the hydrogenation of CO efficiently proceeds to yield H2CO and CH3OH even above 20 K when CO is buried beneath ASW. The experimental results suggest that hydrogen atoms diffuse through the cracks of ASW and have a sufficient residence time to react with embedded CO. The hydrogenation reactions occurred even at temperatures up to ~70 K. Cracks collapse at elevated temperatures but the occurrence of hydrogenation reactions means that the cracks would not completely disappear and remain large enough for penetration by hydrogen atoms. Considering the hydrogen-atom fluence in the laboratory and molecular clouds, we suggest that the penetration of hydrogen and its reactions within the ice mantle occur in astrophysical environments.
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| Publisher |
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IOP Publishing
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| Date |
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| Language |
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| Resource Type |
journal article |
| Version Type |
AM |
| Identifier |
HDL
http://hdl.handle.net/2115/82675
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| Relation |
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isVersionOf
DOI
https://doi.org/10.3847/1538-4357/abab9b
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| Journal |
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The Astrophysical Journal
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Volume Number900
Issue Number2
Page Start1
Page End7
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| Oaidate |
2023-07-26 |
