Low energy collisions between Li + and He are investigated using a molecular expansion which takes account of rotational coupling between the 1 Sigma , 1 Pi and 1 Delta states of the LiHe + quasi-molecule. Differential cross sections for elastic scattering, and for excitation of those states formed by dissociation of the 1 Pi and 1 Delta states, have been computed for incident ion energies of 1.0, 1.5 and 2.0 keV and for a range of scattering angle from 0 to 35 degrees (centre of mass system). The agreement with experiment is satisfactory. It is shown that rotational coupling is an important excitation mechanism in Li + -He collisions.
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McCarroll et al. (1972) studied this question.
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