Positronium-Atom Collisions

Details Positronium-Atom Collisions Positronium-Atom Collisions

2004-01-25

arxiv.org/abs/physics/0401125v1

Physics

Atomic Physics

19 pages, 8 figures. Nucl. Instrum. methods B Accepted

Scientific paper

New results are presented for Ps(1s) scattering by H(1s), He(1$^1$S) 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(1$^1$S) 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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