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Phys Rev Lett. 2011 Jun 17;106(24):243201. Epub 2011 Jun 15.

Dissociative electron attachment cross sections for H2 and D2.

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1
Tata Institute of Fundamental Research, Mumbai, India. ekkumar@tifr.res.in

Abstract

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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