First and Second Born Calculations of (e, 2e) Excitation-Ionization of Helium
Abstract
We report detailed calculations of the first Born triple-differential cross section for (e, 2e) excitation-ionization of ground state He to He+ (n = 2). These are in accord with the very recent work of Kheifets et al and confirm that the first Born amplitude is now known very accurately. We illustrate the sensitivity of the first Born cross section to the choice of initial and final state wavefunctions. We combine our accurate first Born amplitude with an estimate of the second Born term evaluated in the closure approximation. As in previous work we find that second-order effects are significant even up to energies as high as 5.5 keV. Agreement with experiment generally remains not very satisfactory.
Recommended Citation
P. J. Marchalant et al., "First and Second Born Calculations of (e, 2e) Excitation-Ionization of Helium," Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 32, no. 24, pp. L705 - L710, Institute of Physics - IOP Publishing, Dec 1999.
The definitive version is available at https://doi.org/10.1088/0953-4075/32/24/105
Department(s)
Physics
Keywords and Phrases
Approximation theory; Computational methods; Electron transitions; Functions; Ground state; Ionization of gases; Wavefunctions; Helium
International Standard Serial Number (ISSN)
0953-4075
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 1999 Institute of Physics - IOP Publishing, All rights reserved.
Publication Date
01 Dec 1999
