Absolute cross section for electron-impact ionization ofHe(1s2sS3)

Génévriez, Matthieu;Jureta, Jozo;Defrance, Pierre;Urbain, Xavier
(2017) Physical Review A — Vol. 96, n° 1, p. 010701-1 - 010701-4 (2017)

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Abstract
We present an experimental determination of the electron-impact ionization cross section of the 1s2s 3S state of helium, for which there is a serious long-lasting discrepancy between theory and experiment. A technique for the production of a fast, intense beam of helium in the 1s2s 3S state only has been developed for this purpose,based on photodetachment of the He− anion. The cross section is measured using the animated crossed beam technique. The present results are much lower than the experimental data of Dixon et al. [J. Phys. B 9, 2617 (1976)] and are in excellent agreement with the calculation of Fursa and Bray [J. Phys. B 36, 1663 (2003)].
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Génévriez, M., Jureta, J., Defrance, P., & Urbain, X. (2017). Absolute cross section for electron-impact ionization ofHe(1s2sS3). Physical Review A, 96(1), 010701-1 - 010701-4. https://doi.org/10.1103/PhysRevA.96.010701 (Original work published 2017)