The cross sections for energetic electron excitation of the parity-forbidden X 1Σg+ → E, F 1Σg+ transitions are calculated in the Born approximation. The intensities for these forbidden transitions are predicted to be comparable to the intensities of the allowed X 1Σg+ → C 1Πu and X 1Σg+ → B 1Σu+ transitions for scattering angles as small as 0.75° for 34-keV electrons.
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Ford et al. (1971) studied this question.
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