Theoretical and experimental fully differential cross sections are presented for electron-impact ionization of molecular hydrogen in a plane perpendicular to the incident beam direction. The experimental data exhibit a maximum for 1-eV electrons detected 180° apart and a minimum for 10-eV electrons. We investigate the different physical effects which cause back-to-back scattering and demonstrate that, over the energy range from 10 to 1 eV, a direct transition is observed from a region where Wannier threshold physics is essentially unimportant to where it completely dominates.
O. A. Al-Hagan et al., "Electron-impact-ionization cross sections of H₂ for low outgoing electron energies from 1 to 10 eV," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 81, no. 3, pp. 030701-1-030701-4, American Physical Society (APS), Mar 2010.
The definitive version is available at https://doi.org/10.1103/PhysRevA.81.030701
Keywords and Phrases
A-plane; Direct transition; Electron energies; Electron-impact; Electron-impact ionization; Energy ranges; Experimental data; Fully differential cross sections; Incident beam direction; Molecular hydrogen; Physical effects; Wannier; Particle detectors; Impact ionization
International Standard Serial Number (ISSN)
Article - Journal
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01 Mar 2010