Differential cross sections for the charge-transfer reaction ${\mathrm{O}}^{2+}$+He→ ${\mathrm{O}}^{+}$+${\mathrm{He}}^{+}$ at low energies

Differential cross sections have been calculated for the charge-transfer reaction ${\mathrm{O}}^{2+}$ +He→${\mathrm{O}}^{+}$+${\mathrm{He}}^{+}$ at center-of-mass collision energies from 1 to 100 eV. A number of features are predicted, all having semiclassical interpretations: an interference pattern resulting from inelastic scattering on multiple potential surfaces, a ‘‘rainbow’’ effect arising from the polarization in the initial channel, and a ‘‘forward glory’’ effect. At lower collision energies these features become more striking. As the energy released in the charge-transfer reaction becomes comparable to or greater than the initial relative collision energy, inelastic ${\mathrm{O}}^{+}$ ${(\mathrm{}}^2$P°) product ions should move to the outer fringes of the forward scattering cone.