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Acceleration of ion recombination reaction rates in cold dark clouds through spontaneous polarization charge on CO ice mantles

Published online by Cambridge University Press:  12 October 2020

Andrew Cassidy Open the ORCID record for Andrew Cassidy [Opens in a new window] ,
Alexander Rosu-Finsen ,
Jérôme Lasne ,
Martin R. S. McCoustra  and
David Field
Andrew Cassidy
Affiliation:
Department of Physics and Astronomy, Aarhus University, Aarhus8000, Denmark email: amc@phys.au.dk
Alexander Rosu-Finsen
Affiliation:
Department of Chemistry, University College London, London, WC1H 0AJ, UK
Jérôme Lasne
Affiliation:
Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS UMR 7583, Université Paris-Est Créteil, Université Paris Diderot, 94010 Créteil Cedex, France
Martin R. S. McCoustra
Affiliation:
Institute of Chemical Sciences, Heriot-Watt University, Riccarton, EH14 4AS, Edinburgh, UK
David Field
Affiliation:
Department of Physics and Astronomy, Aarhus University, Aarhus8000, Denmark email: amc@phys.au.dk
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Abstract

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We propose a role for CO ice mantles in ion recombination reactions, and demonstrate how the subsequent fall in the degree of gas phase ionization decreases the time required for cloud collapse under gravity by a factor of 5-6. Experimental results demonstrate that CO films prepared at cryo-temperatures spontaneously harbour electric fields immediately upon growth. Using what is known from observations about prestellar cloud conditions in the ISM, we explain how this phenomenon can lead to an acceleration in ion recombination reaction rates. The result is a pathway for cloud collapse to occur before cloud disruption by supernova remnants.

Keywords

ISM: cloudsISM: magnetic fieldsmolecular processes
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S350: Laboratory Astrophysics: From Observations to Interpretation , April 2019 , pp. 390 - 391
Copyright
© International Astronomical Union 2020

References

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