Electron-impact dissociation of HeH+: absolute cross sections for the production of He(q+) (q=1-2) fragments
(2013) Journal of Physics B: Atomic, Molecular and Optical Physics — Vol. 47, n° 1, p. 15203 (2013)
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- Authors
Defrance, Pierre 
- Abstract
- Absolute cross sections have been measured for electron-impact dissociative excitation and ionization of the helium-hydride ion (HeH+) leading to the formation of helium ions Heq+ (q = 1–2). Measurements have been performed for electron energies ranging from the respective thresholds up to 2.5 keV. For He+ production, the maximum absolute cross section for dissociative excitation is found to be (2.5 ± 0.2) ×10−17 cm2 (around 40 eV), while for dissociative ionization, it is found to be (2.1 ± 0.1) ×10−17 cm2 (around 135 eV). For He2+ production, only the inclusive absolute cross section is presented, without attempting to isolate any distinct contribution, and it is measured to be (2.6 ± 0.2) ×10−19 cm2 (around the maximum, 195 eV). Appearance energies for He+ and He2+ are determined to be (11.2 ± 0.5) eV and (66.5 ± 1.0) eV, respectively. Kinetic energy release and angular distributions are obtained, at specific incident electron energies.
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Citations
Lecointre, J., Jureta, J., Urbain, X., & Defrance, P. (2013). Electron-impact dissociation of HeH+: absolute cross sections for the production of He(q+) (q=1-2) fragments. Journal of Physics B: Atomic, Molecular and Optical Physics, 47(1), 15203. https://doi.org/10.1088/0953-4075/47/1/015203 (Original work published 2013)