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Dissociative Electron Attachment Cross Sections for H2 and D2

Krishnakumar, E.; Denifi, S.; Čadež, I.; Markelj, S. and Mason, N. J. (2011). Dissociative Electron Attachment Cross Sections for H2 and D2. Physical Review Letters, 106(24), article no. 3201.

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New measurements of the absolute cross sections for dissociative electron attachment (DEA) in
molecular hydrogen and deuterium are presented which resolve previous ambiguities and provide a
test bed for theory. The experimental methodology is based upon a momentum imaging time-of-flight
spectrometer that allowed us to eliminate any contributions due to electronically excited metastable
neutrals and ultraviolet light while ensuring detection of all the ions. The isotope effect in the DEA
process in the two molecules is found to be considerably larger than previously observed. More
importantly, it is found to manifest in the polar dissociation process (also known as ion pair production)
as well.

Item Type: Journal Article
Copyright Holders: 2011 American Physical Society
ISSN: 0031-9007
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 33047
Depositing User: Astrid Peterkin
Date Deposited: 06 Mar 2012 11:29
Last Modified: 23 Feb 2016 19:22
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