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- W306239971 abstract "Previous measurements of electron excitation out of metastable levels are limited to electron energies low enough that excitation out of the ground level cannot occur since in the target the metastable number density is much less than the ground level number density. In order to measure the excitation cross sections out of metastable levels at higher energies it is necessary to develop a target where the metastable number density is higher than or comparable to the ground level number density. To accomplish this the authors use a metastable target produced by charge exchange of a fast He{sup +} ion beam incident on an alkali target. The charge exchange process is nearly resonant into the 2{sup 1}S or 2{sup 3}S metastable levels of He so that the formation of the He metastable atoms is favored over the ground level atoms. The authors have used this new target to measure electron excitation cross sections out of both metastable levels up to 150 eV by the optical method. The effects of ground level contamination on these measurements are eliminated." @default.
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- W306239971 date "1993-12-01" @default.
- W306239971 modified "2023-09-24" @default.
- W306239971 title "A charge exchange target for measuring cross sections of electron excitation out of metastable levels" @default.
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