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Molecular hydrogen production from amorphous solid water during low energy electron irradiation

  • This work investigates the production of molecular hydrogen isotopologues (H2, HD, and D2) during low energy electron irradiation of layered and isotopically labelled thin films of amorphous solid water (ASW) in ultrahigh vacuum. Experimentally, the production of these molecules with both irradiation time and incident electron energy in the range 400 to 500 eV is reported as a function of the depth of a buried D2O layer in an H2O film. H2 is produced consistently in all measurements, reflecting the H2O component of the film, though it does exhibit a modest reduction in intensity at the time corresponding to product escape from the buried D2O layer. In contrast, HD and D2 production exhibit peaks at times corresponding to product escape from the buried D2O layer in the composite film. These features broaden the deeper the HD or D2 is formed due to diffusion. A simple random-walk model is presented that can qualitatively explain the appearance profile of these peaks as a function of the incident electron penetration.

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Author:Kamel A. K. GadallahORCiD, Demian Marchione, Sven P. K. KöhlerORCiD, Martin R. S. McCoustra
DOI original:https://doi.org/10.1039/C6CP06928B
Parent Title (English):Physical Chemistry Chemical Physics
Publisher:Royal Society of Chemistry
Document Type:Article
Year of Completion:2017
Publishing Institution:Hochschule Hannover
Release Date:2022/06/08
Tag:Amorphes Eis
ASW; amorphous solid water; electron irradiation; molecurlar hydrogen
GND Keyword:Wasserstoffmolekül; Elektronenbestrahlung
First Page:3349
Last Page:3357
Institutes:Fakultät II - Maschinenbau und Bioverfahrenstechnik
DDC classes:660 Technische Chemie
Licence (German):License LogoUrheberrechtlich geschützt