Positronium atom scattering by H_2 in a coupled-channel framework

Details Positronium atom scattering by H_2 in a coupled-channel framework Positronium atom scattering by H_2 in a coupled-channel framework

2000-12-17

arxiv.org/abs/physics/0012039v1

J. Phys. B, 33 (2000) 1575-1584

Physics

Atomic and Molecular Clusters

10 pages, 4 ps figures

Scientific paper

10.1088/0953-4075/33/8/308

The scattering of ortho positronium (Ps) by H$_2$ has been investigated using a three-Ps-state [Ps(1s,2s,2p)H$_2($X $^1\Sigma_g^+$)] coupled-channel model and using Born approximation for higher excitations and ionization of Ps and B $^1\Sigma_u^+$ and b $^3\Sigma_u^+$ excitations of H$_2$. We employ a recently proposed time-reversal-symmetric nonlocal electron-exchange model potential. We present a calculational scheme for solving the body-frame fixed-nuclei coupled-channel scattering equations for Ps-H$_2$, which simplifies the numerical solution technique considerably. Ps ionization is found to have the leading contribution to target-elastic and all target-inelastic processes. The total cross sections at low and medium energies are in good agreement with experiment.

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