Abstract
Triple (TDCS) and double (DDCS) differential cross sections are calculated for ionization of a ground state lithium atom by positron impact at medium high energies for coplanar geometry, using the correlated double continuum wave function (BBK). Some TDCS results for electron impact ionization, obtained from the present model, are also presented for a comparison with the corresponding electron TDCS experiment, and a reasonably good agreement is found. TDCS and DDCS are also calculated for positron impact ionization of a hydrogen atom from its metastable 2S state to compare with the present results of Li atom (in the ground state). A structural resemblance is always found between the two cases, as expected.
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