Ionization of Hydrogen, Hydrogen Deuteride, and Deuterium on Impact of Metastable Helium Atoms
- 1 December 1968
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 49 (11) , 5083-5088
- https://doi.org/10.1063/1.1670002
Abstract
Relative cross sections for the ionization of H2, HD, and D2 have been measured using a thermal-energy beam of 2 3S1 and 2 1S0 helium atoms. The cross sections for the production of H2+, HD+, and D2+ increase in this order. The ions are observed to have average kinetic energies of at least 0.08 eV and perhaps as much as 0.3 eV. The isotope effect is explained in terms of the initial formation of a preionizing state which may then either dissociate or ionize.Keywords
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