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.

DOI: https://doi.org/10.1103/PhysRevLett.106.243201


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.

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