Elastic Scattering of Slow Electrons by Lithium Atoms in the Polarized-Orbital Approximation

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Abstract
We have calculated the low energy elastic cross section for electrons incident on lithium atoms via the polarized-orbital method proposed by Temkin. The only further approximations made are the exclusion of core polarization and the use of frozen core Hartree–Fock wave functions. Quite good agreement with previous close-coupling calculations are obtained in the energy range 0.5–3 eV. Surprisingly, the threshold resonance behavior predicted by the close-coupling results is obtained when exchange is neglected, but not when the full polarized-orbital method is used.

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