A Second-Order Distorted-Wave Model for the Excitation of the 21p State of Helium by Electron and Positron Impact
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.
D. H. Madison and K. H. Winters, "A Second-Order Distorted-Wave Model for the Excitation of the 21p State of Helium by Electron and Positron Impact," Journal of Physics B: Atomic and Molecular Physics, vol. 16, no. 23, pp. 4437-4450, Institute of Physics - IOP Publishing, Jul 1983.
The definitive version is available at http://dx.doi.org/10.1088/0022-3700/16/23/025
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