Efficient Electron-promoted Desorption of Benzene from Water Ice Surfaces

Demian Marchione, John Thrower, Martin R S McCoustra

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15 Citations (Scopus)
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Abstract

Desorption of benzene (C6H6) from solid water surfaces [compact amorphous solid water (c- ASW) and crystalline ice (CI)] during irradiation of ultrathin solid films with low energy (250-300 eV) electrons has been investigated. The observed desorption behaviour is complex but typically two desorption components, with particularly large cross-sections, were present in the observed signal. A fast component, with a cross-section up to 10−15 cm2, is attributed to desorption of isolated C6H6 molecules that are hydrogen-bonded to small clusters of water (H2O) molecules on the solid water surface. A slower component, with a cross-section of ca. 10−17 cm2, is attributed mainly to desorption from larger C6H6 islands on the solid water surface. Possible desorption mechanisms are proposed and astrophysical implications are discussed.
Original languageEnglish
Article numberCP-ART-10-2015-006537.R1
Pages (from-to)4026-4034
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number5
Early online date7 Jan 2016
DOIs
Publication statusPublished - 7 Feb 2016

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