Abstract
The cross section for single ionisation of ground state helium atoms by electron impact has been measured over the energy range from threshold to 750 eV using a crossed electron-fast atom beam technique. The absolute value of the measured cross section is estimated to be accurate to within about +or-6% at a 90% confidence level. Ionisation contributions from excited atoms are negligible. These data are in excellent agreement with those of Rapp and Englander-Golden (1965) who applied the electron beam-static-gas target technique. The mean of these two cross sections is recommended as the best data currently available for ionisation of helium. The experimental procedure is fully described and a detailed assessment is made of the experimental errors.
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Schedule a callMore From: Journal of Physics B: Atomic and Molecular Physics
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