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Solid-state production of complex organic molecules: H-atom addition versus UV irradiation

Published online by Cambridge University Press:  04 September 2018

K.-J. Chuang Open the ORCID record for K.-J. Chuang [Opens in a new window]
K.-J. Chuang*
Affiliation:
Sackler Laboratory, Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands email: [email protected]
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Abstract

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Complex organic molecules (COMs) have been observed in comets, hot cores and cold dense regions of the interstellar medium. It is generally accepted that these COMs form on icy dust grain through the recombination reaction of radicals triggered by either energetic UV-photon or non-energetic H-atom addition processing. In this work, we present for the first time laboratory studies that allow for quantitative comparison of hydrogenation and UV-induced reactions as well as their cumulative effect in astronomically relevant CO:CH3OH=4:1 ice analogues. The formation of glycolaldehyde (GA) and ethylene glycol (EG) is confirmed in pure hydrogenation experiments at 14 K, except methyl formate (MF), which is only clearly observed in photolysis. The fractions for MF:GA:EG are 0 : (0.2-0.4) : (0.8-0.6) for pure hydrogenation, and 0.2 : 0.3 : 0.5 for UV involving experiments and can offer a diagnostic tool to derive the chemical origin of these species. The GA/EG ratios in the laboratory (0.3-1.5) compare well with observations toward different objects.

Keywords

astrochemistryatomic processesmethods: laboratoryISM: atomsISM: moleculesultraviolet: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S332: Astrochemistry VII: Through the Cosmos from Galaxies to Planets , March 2017 , pp. 429 - 434
Copyright
Copyright © International Astronomical Union 2018 

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