Abstract
A simplified form of the first-order many-body theory was used for the calculation of the coherence and correlation parameters for the excitation of the 21P and 31P states of helium. The excited state wave functions were calculated numerically in the fixed core Hartree-Fock(HF) approximation. The ground state wave function was used in the HF approximation. Scattering orbitals were calculated numerically in the static exchange approximation. Calculations were performed forE=29.6, 40, 50, 60 and 80 eV impact energies for the 21P state, and forE=50 eV and 80 eV for the 31P state. Results for the coherence and correlation parameters are compared with the experimental values obtained from electronphoton coincidence experiments, and with other theoretical results.
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