Close-coupling approach to positron scattering for lithium, sodium and potassium

Abstract

Five-state close-coupling calculations are presented for e+-Li (2s-2p-3s-3p-3d), e+-Na (3s-3p-4s-3d-4p) and e+-K (4s-4p-5s-3d-5p) scattering in the energy range 0.5-50 eV. An investigation was made of (i) the convergence of the cross sections with respect to the number of target states, and (ii) the sensitivity of the cross sections to the target wavefunctions employed. A sharp minimum is present in the elastic differential cross section in the vicinity of 40-50' for energies less than 10 eV for all three atoms. Good agreement is obtained between the five-state (effective) total integrated cross sections and experimental results for both e+-Na and e+-K scattering. Show more