A second-order distorted-wave model for the excitation of the 21P state of helium by electron and positron impact
- 14 December 1983
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 16 (23) , 4437-4450
- https://doi.org/10.1088/0022-3700/16/23/025
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.Keywords
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