Near threshold ionisation of helium by electron impact
- 14 November 1978
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 11 (21), 3683-3692
- https://doi.org/10.1088/0022-3700/11/21/014
Abstract
An experimental study of near threshold ionisation of helium has been performed with an electron-impact spectrometer. The energy distribution of the two outgoing electrons was measured for excess energies of up to 6 eV, together with their angular distribution. These experimental results were compared to theoretical calculations and good agreement was found with the theory of Wannier (1953), but in a limited energy range: the predicted isotropy is only verified up to 0.8 eV, whereas the uniformity of the energy distribution is still valid to within 20% at 3.6 eV above threshold.Keywords
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