Abstract
New results are presented for Ps(1s) scattering by H(1s), He(11S) and Li(2s). Calculations have been performed in a coupled state framework, usually employing pseudostates, and allowing for excitation of both the Ps and the atom. In the Ps(1s)–H(1s) calculations the H− formation channel has also been included using a highly accurate H− wave function. Resonances resulting from unstable states in which the positron orbits H− have been calculated and analysed. The new Ps(1s)–He(11S) calculations still fail to resolve existing discrepancies between theory and experiment at very low energies. The possible importance of the Ps− formation channel in all three collision systems is discussed.
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