Positronium-Atom Collisions

Abstract

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.

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

References in corpus (1)

• o-Positronium scattering off H and He

Cited by in corpus (5)

• Formation of positron-atom bound states in collisions between Rydberg Ps and neutral atoms
• Many-body theory for positronium-atom interactions
• Calculations of positronium-atom scattering using a spherical cavity
• Positronium collisions with rare-gas atoms
• Many-body theory for positronium scattering and pickoff annihilation in noble-gas atoms