The coherence and correlation parameters associated with the excitation of the n 3 P (n=2-8) states of helium have been calculated using first-order many-body theory (FOMBT) for the incident electron energy range 25-500 eV. The theoretical results for (L perpendicular to ) and gamma agree well with the limited experimental data for 3 3 P and these parameters are essentially independent of the principal quantum number for fixed incident electron energy.
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Cartwright et al. (1986) studied this question.
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