Thermal desorption of water ice in the interstellar medium

Fraser, Helen J. and Collings, Mark P. and McCoustra, Martin R.S. and Williams, David A. (2001) Thermal desorption of water ice in the interstellar medium. Monthly Notices of the Royal Astronomical Society, 327 (4). pp. 1165-1172. ISSN 0035-8711 (https://doi.org/10.1046/j.1365-8711.2001.04835.x)

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Abstract

Water (H2O) ice is an important solid constituent of many astrophysical environments. To comprehend the role of such ices in the chemistry and evolution of dense molecular clouds and comets, it is necessary to understand the freeze-out, potential surface reactivity, and desorption mechanisms of such molecular systems. Consequently, there is a real need from within the astronomical modelling community for accurate empirical molecular data pertaining to these processes. Here we give the first results of a laboratory programme to provide such data. Measurements of the thermal desorption of H2O ice, under interstellar conditions, are presented. For ice deposited under condi- tions that realistically mimic those in a dense molecular cloud, the thermal desorption of thin films (50 molecular layers) is found to occur with zero order kinetics charac- terised by a surface binding energy, Edes, of 5773 ±60 K, and a pre-exponential factor, A, of 1030±2 molecules cm−2 s−1. These results imply that, in the dense interstellar medium, thermal desorption of H2O ice will occur at significantly higher temperatures than has previously been assumed.

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  Item type:	Article
  ID code:	2914
  Dates:	Date Event 7 November 2001 Published
  Keywords:	molecular data, molecular processes, methods, laboratory, ISM, molecules, nanoscience, Astronomy, Astronomy and Astrophysics, Space and Planetary Science
  Subjects:	Science > Astronomy
  Department:	Faculty of Science > Physics
  Depositing user:	Strathprints Administrator
  Date deposited:	15 Feb 2007
  Last modified:	30 Mar 2023 01:15
  Related URLs:	http://arxiv.org/PS_cache/astro-ph/pdf/0...
  URI:	https://strathprints.strath.ac.uk/id/eprint/2914