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Emission cross-sections have been measured for two processes involving two active atomic electrons produced by electron impact (50–300 eV) on helium. One of the spectral lines observed, 30.4 nm, is from the simultaneous ionization and excitation to the 2p state of He+. Evidence for the indirect population of this state due to autoionization of He(3l,3l′) states is also observed. The other line, 32...
Measurements of simultaneous ionization and excitation of ground-state helium to the 2p state of the helium ion by electron impact are presented by observing electron-photon coincidences between the 30.4-nm photon radiation and a scattered outgoing electron. Our results are then compared with theoretical calculations.
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