Elastic scattering of electrons and positrons by lithium atoms

The eikonal approximation has been used to investigate e±-Li scattering in the energy region E=0.8 to 500 eV. In addition to the static potential, the effect of the polarization potential has been included explicitly. Our results for the total cross section of e⁻-Li scattering in the energy region 4≤E≤10 eV are in close agreement with the recent experimental findings as well as with the theoretical results obtained by various authors using the close-coupling approximation. In the energy region 10<E≤500 eV, the present approach yields higher values than first Born approximation (FBA). Our results for the total cross section for e⁺-Li scattering in the eikonal approximation are displayed and compared with the corresponding polarized FBA results and the results obtained by the polarized-orbital method. Results for the differential cross sections for both the systems e±-Li in the eikonal approximation are also presented together with the corresponding polarized FBA results.