Title

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.

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.

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