The energy dependence of the total cross section for symmetric charge exchange in helium is measured in the range from 400-2000 eV. Beam-attenuation techniques are used, and all measurements are made on the forward-scattered ions and the high-energy neutrals resulting from the charge exchange. Cross-section values are given at 100-eV intervals, and the results show a cross section decreasing as the energy increases, with a value at 1000 eV of 1.04 ×{} 10^-15 cm². The absolute cross sections are accurate to ±{} 12%. Relative cross-section values accurate to ±{} 6% are reported.
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Nagy et al. (1969) studied this question.
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