Excitation of the 3 1 D state of helium by electron impact has been studied by measurement of the linear and circular polarisation of the decay radiation emitted perpendicular to the scattering plane in a polarisation correlation experiment. Results are presented over the angular range 40-120' at an incident electron energy of 40 eV. Recent data in the angular range 31.2-50' by Beijers et al. (1986-7) are confirmed but recent calculations do not agree well with experiment.
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Donnelly et al. (1988) studied this question.
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