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Formation of NH2CHO and CH3CHO upon UV processing of interstellar ice analogs

Published online by Cambridge University Press:  12 October 2020

Rafael Martín-Doménech Open the ORCID record for Rafael Martín-Doménech [Opens in a new window] ,
Karin I. Öberg  and
Mahesh Rajappan
Rafael Martín-Doménech
Affiliation:
Center for Astrophysics | Harvard & Smithsonian 60 Garden St, Cambridge, MA, 02138, USA email: [email protected]
Karin I. Öberg
Affiliation:
Center for Astrophysics | Harvard & Smithsonian 60 Garden St, Cambridge, MA, 02138, USA email: [email protected]
Mahesh Rajappan
Affiliation:
Center for Astrophysics | Harvard & Smithsonian 60 Garden St, Cambridge, MA, 02138, USA email: [email protected]
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Abstract

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Complex organic molecules (COMs) may have played a role in the formation of life in the early Earth (Herbst & van Dishoeck (2009)). Here we present the formation of NH2CHO and CH3CHO upon vacuum-ultraviolet (VUV) irradiation of CO:NH3 and CO:CH4 ice mixtures, simulating the UV processing of interstellar ices in the interior of dense clouds. We have found that the conversion from ${\rm{N}}{{\rm{H}}_{\dot 2}}$ radicals to NH2CHO is 4–15 times higer than that from ${\rm{N}}{{\rm{H}}_{\dot 3}}$ to CH3CHO, probably due to the competing formation of larger hydrocarbons in the latter case.

Keywords

ISM: cloudsISM: kinematics and dynamicsISM: molecules
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S350: Laboratory Astrophysics: From Observations to Interpretation , April 2019 , pp. 417 - 419
Copyright
© International Astronomical Union 2020

References

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