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The integrated ionization cross section for positron-lithium scattering is examined within the framework of the distorted-wave theory. In the present implementation of this method the distortion potential in the final channel represents a sum of Coulomb interactions between the nucleus and both the scattered positron and the ejected electron. The strength of these interactions is given by effective charges that vary with the energies of the two free particles. Two different sets of effective charges are used. In addition, a completely orthogonalized first Born approximation for lithium is derived analytically.

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