Strathprints logo
Strathprints Home | Open Access | Browse | Search | User area | Copyright | Help | Library Home | SUPrimo

Desorption of hot molecules from photon irradiated interstellar ices

Thrower, J.D. and Burke, D.J. and Collings, M.P. and Dawes, A. and Holtom, P.D. and Jamme, F. and Kendall, P. and Fraser, H.J. (2008) Desorption of hot molecules from photon irradiated interstellar ices. Astrophysical Journal, 673. pp. 1233-1239. ISSN 0004-637X

[img]
Preview
PDF (strathprints006189.pdf)
strathprints006189.pdf

Download (2MB) | Preview

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.

Item type: Article
ID code: 6189
Keywords: astrophysics, benzene molecule, photodesorption, lasers, interstellar ices, hot molecules, Optics. Light, Astronomy, Astronomy and Astrophysics, Space and Planetary Science
Subjects: Science > Physics > Optics. Light
Science > Astronomy
Department: Faculty of Science > Physics
Depositing user: Miss Darcy Spiller
Date Deposited: 02 Jun 2008
Last modified: 24 Jul 2015 10:05
Related URLs:
URI: http://strathprints.strath.ac.uk/id/eprint/6189

Actions (login required)

View Item View Item