A calculation of the 1 1 S-2 3 P excitation of helium by electron impact is described. The cross section is calculated by means of the distorted-wave method with full allowance for both direct and exchange potential distortion of the colliding electron wave functions. The calculation is performed with a more accurate ground state wave function than the one used by Massey and Moiseiwitsch. Finally, a comparison is made between the calculated cross sections and experiment.
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C. N. Lashmore‐Davies (1965) studied this question.
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