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

Thrower, JD; Abdulgalil, AGM; Collings, MP; McCoustra, MRS; Burke, DJ; Brown, WA; Dawes, A; (2010) Photon- and electron-stimulated desorption from laboratory models of interstellar ice grains. In: JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A. (pp. 799 - 806). A V S AMER INST PHYSICS

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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]

Type: Proceedings paper
Title: Photon- and electron-stimulated desorption from laboratory models of interstellar ice grains
Event: 56th Annual Meeting of the American-Vacuum-Society
Location: San Jose, CA
Dates: 2009-11-08 - 2009-11-13
DOI: 10.1116/1.3336466
Keywords: TEMPERATURE-PROGRAMMED DESORPTION, AMORPHOUS SOLID WATER, MOLECULAR-HYDROGEN, THERMAL-DESORPTION, GRAPHITE SURFACE, RADIATION-FIELD, DENSE CLOUDS, DUST, PHOTODESORPTION, EMISSION
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry
URI: http://discovery.ucl.ac.uk/id/eprint/115449
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