Formation of theH−ion in the positronium–hydrogen-atom collision

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The cross sections (both differential and total) for ${\mathrm{H}}^{\ensuremath{-}}$ formation in the process $\mathrm{Ps}(1s)+\mathrm{H}(1s)\ensuremath{\rightarrow}{e}^{+}+{\mathrm{H}}^{\ensuremath{-}}$ in the energy range $10--500\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ have been studied. The calculations have been performed in the framework of the Coulomb-modified eikonal approximation and take account of the long-range Coulomb attraction between the outgoing ${e}^{+}$ and ${\mathrm{H}}^{\ensuremath{-}}$ ion in the final channel.