Title

A Second-Order Distorted-Wave Model for the Excitation of the 21p State of Helium by Electron and Positron Impact

Abstract

The second-order distorted-wave amplitude is evaluated in a high-energy approximation. In this approximation, the non-local second-order distorting potential is replaced by a local second-order potential obtained in the closure approximation. It is shown that for the case of electron excitation of the 21P state of helium, the second-order effects are fairly large and improve agreement with experimental data. It is also noted, however, that the best agreement with experimental data may be obtained through a hybrid first-order calculation. Results for positron excitation of helium are also given and discussed.

Department(s)

Physics

International Standard Serial Number (ISSN)

0022-3700

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1983 Institute of Physics - IOP Publishing, All rights reserved.

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