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A distorted-wave approximation is used to calculate differential and total cross sections for the electron excitation of helium from the metastable 2 3 S state to the 2 3 P, 3 3 S and 3 3 P states for electron energies from 10 to 30 eV. Values of the asymmetry parameter for the scattering of spin-polarised electrons from spin-polarised metastable helium atoms are also given. The present results are compared with previous calculations and recent experimental measurements of the differential cross sections.
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Mathur et al. (1987) studied this question.
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