The expression for the cross-section obtained from the second Born approximation by including only terms to the third order in the interaction energy is employed to calculate cross-sections for the electron impact excitation of the 2s level of atomic hydrogen, allowance being made for distortion and polarization due to the 1s, 2s and 2p0.± 1 intermediate states. These cross-sections are compared with the available experimental data.
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Kingston et al. (1960) studied this question.
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