Desorption of hot molecules from photon irradiated interstellar ices

J.D. Thrower, D.J. Burke, M.P. Collings, A. Dawes, P. J. 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

26 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.
LanguageEnglish
Pages1233-1239
Number of pages6
JournalAstrophysical Journal
Volume673
Issue number2
DOIs
Publication statusPublished - 1 Feb 2008

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desorption
ice
benzene
photons
molecules
temperature
water
mass spectrometry
laser
astrophysics
mass spectroscopy
substrate
matrix
chemistry
vapor phases
gas
energy
matrices
electronics
lasers

Keywords

  • astrophysics
  • benzene molecule
  • photodesorption
  • lasers
  • interstellar ices
  • hot molecules

Cite this

Thrower, J. D., Burke, D. J., Collings, M. P., Dawes, A., Holtom, P. J., Jamme, F., ... Parker, A. W. (2008). Desorption of hot molecules from photon irradiated interstellar ices. Astrophysical Journal, 673(2), 1233-1239. https://doi.org/10.1086/524097
Thrower, J.D. ; Burke, D.J. ; Collings, M.P. ; Dawes, A. ; Holtom, P. J. ; Jamme, F. ; Kendall, P. ; Brown, W. A. ; Clark, I. P. ; Fraser, H.J. ; McCoustra, M. R. S. ; Mason, N. J. ; Parker, A. W. / Desorption of hot molecules from photon irradiated interstellar ices. In: Astrophysical Journal. 2008 ; Vol. 673, No. 2. pp. 1233-1239.
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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.",
keywords = "astrophysics, benzene molecule, photodesorption, lasers, interstellar ices, hot molecules",
author = "J.D. Thrower and D.J. Burke and M.P. Collings and A. Dawes and Holtom, {P. J.} and F. Jamme and P. Kendall and Brown, {W. A.} and Clark, {I. P.} and H.J. Fraser and McCoustra, {M. R. S.} and Mason, {N. J.} and Parker, {A. W.}",
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Thrower, JD, Burke, DJ, Collings, MP, Dawes, A, Holtom, PJ, Jamme, F, Kendall, P, Brown, WA, Clark, IP, Fraser, HJ, McCoustra, MRS, Mason, NJ & Parker, AW 2008, 'Desorption of hot molecules from photon irradiated interstellar ices' Astrophysical Journal, vol. 673, no. 2, pp. 1233-1239. https://doi.org/10.1086/524097

Desorption of hot molecules from photon irradiated interstellar ices. / Thrower, J.D.; Burke, D.J.; Collings, M.P.; Dawes, A.; Holtom, P. J.; Jamme, F.; Kendall, P.; Brown, W. A.; Clark, I. P.; Fraser, H.J.; McCoustra, M. R. S.; Mason, N. J.; Parker, A. W.

In: Astrophysical Journal, Vol. 673, No. 2, 01.02.2008, p. 1233-1239.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Desorption of hot molecules from photon irradiated interstellar ices

AU - Thrower, J.D.

AU - Burke, D.J.

AU - Collings, M.P.

AU - Dawes, A.

AU - Holtom, P. J.

AU - Jamme, F.

AU - Kendall, P.

AU - Brown, W. A.

AU - Clark, I. P.

AU - Fraser, H.J.

AU - McCoustra, M. R. S.

AU - Mason, N. J.

AU - Parker, A. W.

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N2 - 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.

AB - 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.

KW - astrophysics

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Thrower JD, Burke DJ, Collings MP, Dawes A, Holtom PJ, Jamme F et al. Desorption of hot molecules from photon irradiated interstellar ices. Astrophysical Journal. 2008 Feb 1;673(2):1233-1239. https://doi.org/10.1086/524097