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Close-coupling approach to electron-impact ionization of helium

Bray, I., Fursa, D.V. and Stelbovics, A.T. (2001) Close-coupling approach to electron-impact ionization of helium. Physical Review A - Atomic, Molecular, and Optical Physics, 63 (4).

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The close-coupling theory of electron-impact ionization of helium is studied. It is found that the "raw" convergent close-coupling equal-energy-sharing amplitudes converge to half the required amplitudes. As in the e-H case, solving the close-coupling equations yields amplitudes that behave as results of a finite Fourier expansion of a step function. We argue that the close-coupling formalism readily solves the e-He ionization problem with equal-energy outgoing electrons at all practical incident energies, and demonstrate it at the most difficult kinematic case of 2 eV above threshold.

Item Type: Journal Article
Murdoch Affiliation(s): Centre for Atomic, Molecular and Surface Physics
Publisher: The American Physical Society
Copyright: © 2001 The American Physical Society.
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