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

doi:10.1021/acsearthspacechem.7b00028

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

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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 language	English
Pages (from-to)	209-215
Number of pages	7
Journal	ACS Earth and Space Chemistry
Volume	1
Issue number	4
Early online date	23 May 2017
DOIs	https://doi.org/10.1021/acsearthspacechem.7b00028
Publication status	Published - 15 Jun 2017

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title = "Electron-Promoted Desorption from Water Ice Surfaces: Neutral Gas-Phase Products",

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 similarkinetics to those for the loss of water from the substrate film. Desorption of other neutral species from the irradiated film is also discussed.",

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doi = "10.1021/acsearthspacechem.7b00028",

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T1 - Electron-Promoted Desorption from Water Ice Surfaces: Neutral Gas-Phase Products

AU - Abdulgalil, Ali Ghith Moussa

AU - Rosu-Finsen, Alexander

AU - Marchione, Demian

AU - Thrower, John

AU - Collings, Mark P.

AU - McCoustra, Martin R. S.

PY - 2017/6/15

Y1 - 2017/6/15

N2 - 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 similarkinetics to those for the loss of water from the substrate film. Desorption of other neutral species from the irradiated film is also discussed.

AB - 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 similarkinetics to those for the loss of water from the substrate film. Desorption of other neutral species from the irradiated film is also discussed.

U2 - 10.1021/acsearthspacechem.7b00028

DO - 10.1021/acsearthspacechem.7b00028

M3 - Article

SN - 2472-3452

VL - 1

SP - 209

EP - 215

JO - ACS Earth and Space Chemistry

JF - ACS Earth and Space Chemistry

IS - 4

ER -

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

Abstract

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