Electron-Promoted Desorption from Water Ice Surfaces: Neutral Gas-Phase Products

Ali Ghith Moussa Abdulgalil, Alexander Rosu-Finsen, Demian Marchione, John Thrower, Mark P. Collings, Martin R. S. McCoustra

Research output: Contribution to journalArticle

6 Citations (Scopus)
15 Downloads (Pure)

Abstract

Electron-promoted desorption (EPD) from compact amorphous solid water (c-ASW) has been studied. Low-energy electron bombardment with 200 to 300 eV electrons leads to H2O desorption as monitored by reflection-absorption infrared spectroscopy (RAIRS) of the remaining c-ASW film. Cross-sections for desorption were calculated to be in the range 1.6±1.0 × 10-16 to 5.2±3.0 × 10-16 cm2. Quadrupole mass spectrometry measurements identify a major component of the desorbing material as molecular hydrogen which is seen to appear with similar
kinetics to those for the loss of water from the substrate film. Desorption of other neutral species from the irradiated film is also discussed.
Original languageEnglish
Pages (from-to)209-215
Number of pages7
JournalACS Earth and Space Chemistry
Volume1
Issue number4
Early online date23 May 2017
DOIs
Publication statusPublished - 15 Jun 2017

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