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The elastic scattering and rotational excitation cross sections for e - -H 2 are calculated in the adiabatic nuclei approximation, using the 'semiclassical' and 'free-electron-gas' local exchange approximations. The integrated elastic scattering results are compared to calculations in which exchange was treated 'exactly', over the energy range of 0 to 20 eV. The semiclassical exchange approximation is found to agree best with the 'exact' results for energies above 6 eV. The differential elastic and rotational excitation cross sections, for the various local exchange approximations, are compared with experimental measurements and a similar semiclassical exchange calculation at 10 eV.
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Baille et al. (1977) studied this question.
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