The differential cross sections for electrons scattered by He, O, Ar, and O₂ at 15 eV and by O and O₂ at 5 eV have been determined using a modulated crossed-beam technique. The results for He, Ar and O₂ agree well with previously published experimental and theoretical values. Measurements on O₂ extend to larger back-scattered angles than previously reported. Results for O are compared with the theoretical calculations of Thomas and Nesbet. Reasonable agreement with theory is obtained at 5 eV, and while the calculations only extend to 11.0 eV, the trend in shape appears correct at 15 eV. A small-angle dip in the cross section is observed which is not predicted by the theory.
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Dehmel et al. (1976) studied this question.
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