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

Ali G. M. Abdulgalil; Alexander Rosu-Finsen; Demian Marchione; John D. 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 G. M. Abdulgalil, Alexander Rosu-Finsen^*, Demian Marchione, John D. Thrower, Mark P. Collings, Martin R. S. McCoustra

^*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

15 Citationer (Scopus)

Abstract

Electron-promoted desorption (EPD) from compact amorphous solid water (c-ASW) has been studied. Low-energy electron bombardment with 200-300 eV electrons leads to H ₂O depletion, as monitored by reflection-absorption infrared spectroscopy (RAIRS) of the remaining c-ASW film. Cross sections for H ₂O depletion were calculated to be in the range from 1.6 ± 1.0 × 10 ^-16 to 5.2 ± 3.0 × 10 ^-16 cm ². However, mass spectrometric measurements identify a major component of the desorbing material as H ₂, which appears with kinetics similar to those for H ₂O loss. Molecular H ₂O is observed as a minor desorption product in the gas phase.

Originalsprog	Engelsk
Tidsskrift	ACS Earth and Space Chemistry
Vol/bind	1
Nummer	4
Sider (fra-til)	209-215
Antal sider	7
ISSN	2472-3452
DOI	https://doi.org/10.1021/acsearthspacechem.7b00028
Status	Udgivet - 15 jun. 2017
Udgivet eksternt	Ja

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@article{ea06d65604d04936a33ca88d6074da94,

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 200-300 eV electrons leads to H 2O depletion, as monitored by reflection-absorption infrared spectroscopy (RAIRS) of the remaining c-ASW film. Cross sections for H 2O depletion were calculated to be in the range from 1.6 ± 1.0 × 10 -16 to 5.2 ± 3.0 × 10 -16 cm 2. However, mass spectrometric measurements identify a major component of the desorbing material as H 2, which appears with kinetics similar to those for H 2O loss. Molecular H 2O is observed as a minor desorption product in the gas phase.",

keywords = "AMORPHOUS SOLID WATER, ANALOGS, CHEMISTRY, GRAIN SURFACES, H2O, HYDROGEN, INTERSTELLAR ICE, ISM, MOLECULES, PHOTODESORPTION, STIMULATED PRODUCTION, THERMAL-DESORPTION, electron irradiation, molecular cloud, non-thermal desorption",

author = "Abdulgalil, {Ali G. M.} and Alexander Rosu-Finsen and Demian Marchione and Thrower, {John D.} and Collings, {Mark P.} and McCoustra, {Martin R. S.}",

year = "2017",

month = jun,

day = "15",

doi = "10.1021/acsearthspacechem.7b00028",

language = "English",

volume = "1",

pages = "209--215",

journal = "ACS Earth and Space Chemistry",

issn = "2472-3452",

publisher = "American Chemical Society",

number = "4",

}

TY - JOUR

T1 - Electron-Promoted Desorption from Water Ice Surfaces

T2 - Neutral Gas Phase Products

AU - Abdulgalil, Ali G. M.

AU - Rosu-Finsen, Alexander

AU - Marchione, Demian

AU - Thrower, John D.

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 200-300 eV electrons leads to H 2O depletion, as monitored by reflection-absorption infrared spectroscopy (RAIRS) of the remaining c-ASW film. Cross sections for H 2O depletion were calculated to be in the range from 1.6 ± 1.0 × 10 -16 to 5.2 ± 3.0 × 10 -16 cm 2. However, mass spectrometric measurements identify a major component of the desorbing material as H 2, which appears with kinetics similar to those for H 2O loss. Molecular H 2O is observed as a minor desorption product in the gas phase.

AB - Electron-promoted desorption (EPD) from compact amorphous solid water (c-ASW) has been studied. Low-energy electron bombardment with 200-300 eV electrons leads to H 2O depletion, as monitored by reflection-absorption infrared spectroscopy (RAIRS) of the remaining c-ASW film. Cross sections for H 2O depletion were calculated to be in the range from 1.6 ± 1.0 × 10 -16 to 5.2 ± 3.0 × 10 -16 cm 2. However, mass spectrometric measurements identify a major component of the desorbing material as H 2, which appears with kinetics similar to those for H 2O loss. Molecular H 2O is observed as a minor desorption product in the gas phase.

KW - AMORPHOUS SOLID WATER

KW - ANALOGS

KW - CHEMISTRY

KW - GRAIN SURFACES

KW - H2O

KW - HYDROGEN

KW - INTERSTELLAR ICE

KW - ISM

KW - MOLECULES

KW - PHOTODESORPTION

KW - STIMULATED PRODUCTION

KW - THERMAL-DESORPTION

KW - electron irradiation

KW - molecular cloud

KW - non-thermal desorption

UR - http://www.scopus.com/inward/record.url?scp=85042586299&partnerID=8YFLogxK

U2 - 10.1021/acsearthspacechem.7b00028

DO - 10.1021/acsearthspacechem.7b00028

M3 - Journal 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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