Absolute differential and total cross sections for single electron capture in low-energyKr+−Arcollisions

Abstract

Absolute differential and total cross sections for single electron capture were determined from ${\mathrm{Kr}}^{+}$ ions on Ar in the energy range 0.3--5.0 keV. Using reduced variables $[\ensuremath{\tau}=E\ensuremath{\theta}$ vs $\ensuremath{\theta}\mathrm{sin}(\ensuremath{\theta})d\ensuremath{\sigma}/d\ensuremath{\Omega}=\ensuremath{\rho}],$ we deduced, from the experimental differential cross sections, that the electron capture channel ``opens'' at a critical projectile-target separation between ${1.63a}_{0}$ and ${2.21a}_{0}$ in the present energy range and that at least two different processes are involved. The total cross section for single electron capture is compared with other available measurements. These results give a general shape of the curve for single electron capture cross sections for the ${\mathrm{Kr}}^{+}\ensuremath{-}\mathrm{A}\mathrm{r}$ system in a wide range of energy.