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Photon- and electron-stimulated desorption from laboratory models of interstellar ice grains

Thrower, J. D. and Abdulgalil, A. G. M. and Collings, M. P. and McCoustra, M. R. S. and Burke, D. J. and Brown, W. A. and Dawes, A. and Holtom, P. J. and Kendall, P. and Mason, N. J. and Jamme, F. and Fraser, H. J. and Rutten, F. J. M. (2010) Photon- and electron-stimulated desorption from laboratory models of interstellar ice grains. Journal of Vacuum Science and Technology A, 28 (4). pp. 799-806. ISSN 0734-2101

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Abstract

The nonthermal desorption of water from ice films induced by photon and low energy electron irradiation has been studied under conditions mimicking those found in dense interstellar clouds. Water desorption following photon irradiation at 250 nm relies on the presence of an absorbing species within the H2O ice, in this case benzene. Desorption cross sections are obtained and used to derive first order rate coefficients for the desorption processes. Kinetic modeling has been used to compare the efficiencies of these desorption mechanisms with others known to be in operation in dense clouds. (C) 2010 American Vacuum Society. [DOI: 10.1116/1.3336466]