Spin Polarization in Proton-Krypton Charge-Exchange Collisions

In proton-krypton charge-transfer collisions hydrogen is produced in the ground state and the krypton ions are preferentially populated in the ground (${}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}$) state when the protons are incident at about 100 eV. The preferential population of ${\mathrm{Kr}}^{+}\left({}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}\right)$ over ${\mathrm{Kr}}^{+}\left({}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{}\right)$ means that the hydrogen atoms will emerge spin polarized. We have calculated the spin-polarization fraction at 100 eV as a function of impact parameter and as a function of scattering angle, and the results are reported in this paper. A comparison of these results with the results of previous calculations of proton-xenon charge transfer indicates that the latter process is more suitable for producing spin-polarized hydrogen, at least for small scattering angles.