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H2 photochemistry in interstellar ices:The formation of HCO in UV irradiated CO:H2 ice mixtures

Published online by Cambridge University Press:  12 October 2020

K.-J. Chuang Open the ORCID record for K.-J. Chuang [Opens in a new window] ,
G. Fedoseev ,
D. Qasim Open the ORCID record for D. Qasim [Opens in a new window] ,
S. Ioppolo ,
E. F. van Dishoeck Open the ORCID record for E. F. van Dishoeck [Opens in a new window] ,
C. Jäger Open the ORCID record for C. Jäger [Opens in a new window] ,
T. Henning  and
H. Linnartz Open the ORCID record for H. Linnartz [Opens in a new window]
K.-J. Chuang
Affiliation:
Laboratory for Astrophysics, Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands Laboratory Astrophysics Group of the Max Planck Institute for Astronomy at the Friedrich Schiller University Jena, Institute of Solid State Physics, Helmholtzweg 3, D-07743 Jena, Germany
G. Fedoseev
Affiliation:
Laboratory for Astrophysics, Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands
D. Qasim
Affiliation:
Laboratory for Astrophysics, Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands
S. Ioppolo
Affiliation:
Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK76AA, UK
E. F. van Dishoeck
Affiliation:
Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands
C. Jäger
Affiliation:
Laboratory Astrophysics Group of the Max Planck Institute for Astronomy at the Friedrich Schiller University Jena, Institute of Solid State Physics, Helmholtzweg 3, D-07743 Jena, Germany
T. Henning
Affiliation:
Laboratory Astrophysics Group of the Max Planck Institute for Astronomy at the Friedrich Schiller University Jena, Institute of Solid State Physics, Helmholtzweg 3, D-07743 Jena, Germany
H. Linnartz
Affiliation:
Laboratory for Astrophysics, Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands
Rights & Permissions [Opens in a new window]

Abstract

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The role of H2 in forming interstellar complex organics is still not clear due to the high activation energies required for “non-energetic” association reactions. In this work, we investigated the potential contribution of H2 to the hydrogenated species (HnNCO) formation on dust grains when the “energetic” processing is involved. The goal is to test whether an additional hydrogenation pathway is possible upon UV irradiation of a CO:H2 ice mixture. It is proposed that the electronically excited carbon monoxide (CO*) induced by UV-photons can react with a ground-state H2 to form HCO, ultimately enhancing the production of COMs in ice mantle.

Keywords

astrochemistrymethods:laboratory: solid stateultraviolet: ISMISM: molecules
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S350: Laboratory Astrophysics: From Observations to Interpretation , April 2019 , pp. 404 - 405
Copyright
© International Astronomical Union 2020

References

Chuang, K.-J., Fedoseev, G., Qasim, D., Ioppolo, S., van Dishoeck, E. F., & Linnartz, H. 2017, MNRAS, 540, L49Google Scholar
Chuang, K.-J., Fedoseev, G., Qasim, D., Ioppolo, S., van Dishoeck, E.F., & Linnartz, H. 2018, A&A, 617, A87Google Scholar
Ioppolo, S., Fedoseev, G., Lamberts, T., Romanzin, C., & Linnartz, H. 2013, Rev. Sci. Instrum., 84, 073112CrossRefGoogle Scholar