Electron-impact ionization of He(1s2s ³S) and He⁻(1s2s2p ⁴Po)

Génévriez, Matthieu;Jureta, Jozo;Defrance, Pierre;Urbain, Xavier
(2017) INTERNATIONAL CONFERENCE ON PHOTONIC ELECTRONIC AND ATOMIC COLLISIONS — Location: Cairns, Australia

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Abstract
We present experimental cross section for electron impact single and double ionization of He(1s2s 3S) and for ionization of He−(1s2s2p 4P). The experiment has required the development of a novel source producing a fast, intense beam of He(1s2s 3S) with high purity, based upon the photodetachment of He−. The results for single ionization of He(1s2s 3S) solve a long-lasting discrepancy between theory and experiment, while the results for double ionization are the first determination of the cross section for these processes.
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Génévriez, M., Jureta, J., Defrance, P., & Urbain, X. (2017). Electron-impact ionization of He(1s2s ³S) and He⁻(1s2s2p ⁴Po). INTERNATIONAL CONFERENCE ON PHOTONIC ELECTRONIC AND ATOMIC COLLISIONS, Cairns, Australia. https://hdl.handle.net/2078.5/214450