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Photon- and electron-stimulated desorption from laboratory models of interstellar ice grains.
Presented at: 56th Annual Meeting of the American-Vacuum-Society, San Jose, CA.
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:||Conference item (UNSPECIFIED)|
|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:||08 November 2009 - 13 November 2009|
|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
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry
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