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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

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Surface science investigations of photoprocesses in model interstellar ices

Thrower, J.D. and Collings, M.P. and McCoustra, M.R.S. and Burke, D.J. and Brown, W.A. and Dawes, A. and Holtom, P.D. and Fraser, H.J. (2008) Surface science investigations of photoprocesses in model interstellar ices. Journal of Vacuum Science and Technology A, 26 (4). pp. 919-924. ISSN 0734-2101

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Abstract

The kinetic energy of benzene and water molecules photodesorbed from astrophysically relevant ices on a sapphire substrate under irradiation by a UV laser tuned to the S1←S0 →* transition of benzene has been measured using time-of-flight mass spectrometry. Three distinct photodesorption mechanisms have been identified-a direct adsorbate-mediated desorption of benzene, an indirect adsorbate-mediated desorption of water, and a substrate-mediated desorption of both benzene and water. The translational temperature of each desorbing population was well in excess of the ambient temperature of the ice matrix