Excitation of the 4 3 S and 4 3 D states of helium in He(2 3 S)-He(1 1 S) collisions has been studied in the energy range 20-100 keV. Cross sections for the excitation of the He(1 1 S) target and He(2 3 S) projectile to these levels have been separately determined and shown to considerably exceed corresponding cross sections for excitation in He(1 1 S)-He(1 1 S) collisions.
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McCullough et al. (1973) studied this question.
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