The absolute differential excitation cross section of the 2 3 S state of helium at 90 degrees scattering angle is obtained from threshold to 3.6 eV above. The energy transmission efficiency of the post-collision analyzer of the electron impact spectrometer is obtained from the known characteristics of the ionization process near threshold. The results are made absolute by normalization to accurate elastic cross section of helium. Recently calculated cross sections are in good agreement with these measurements.
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Pichou et al. (1975) studied this question.
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