Desorption of hot molecules from photon irradiated interstellar ices

J. D. Thrower, D. J. Burke, M. P. Collings, A. Dawes, P. D. Holtom, F. Jamme, P. Kendall, W. A. Brown, I. P. Clark, H. J. Fraser, M. R S McCoustra, N. J. Mason, A. W. Parker

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

We present experimental measurements of photodesorption from ices of astrophysical relevance. Layers of benzene and water ice were irradiated with a laser tuned to an electronic transition in the benzene molecule. The translational energy of desorbed molecules was measured by time-of-flight (ToF) mass spectrometry. Three distinct photodesorption processes were identified: a direct adsorbate-mediated desorption producing benzene molecules with a translational temperature of around 1200 K, an indirect adsorbate-mediated desorption resulting in water molecules with a translational temperature of around 450 K, and a substrate-mediated desorption of both benzene and water producing molecules with translational temperatures of around 530 and 450 K, respectively. The translational temperature of each population of desorbed molecules is well above the temperature of the ice matrix. The implications for gas-phase chemistry in the interstellar medium are discussed. © 2008. The American Astronomical Society. All rights reserved.

Original languageEnglish
Pages (from-to)1233-1239
Number of pages7
JournalAstrophysical Journal
Volume673
Issue number2
DOIs
Publication statusPublished - 1 Feb 2008

Keywords

  • Astrochemistry
  • Comets: general
  • ISM: molecules
  • Methods: laboratory
  • Ultraviolet: ISM

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