Charge transfer ofC3+ions in atomic hydrogen

Cross sections are calculated for the charge transfer of ${\mathrm{C}}^{3+}$ ions in atomic hydrogen at impact energies up to 5 keV. Agreement is satisfactory with both the low-energy data below 250 eV and the high-energy data above 2 keV. The calculations show that the cross-section behavior is largely due to capture into the $1s^{2}2s3s{}_{}{}^3{}_{}{}^{}S$ state of ${\mathrm{C}}^{2+}$ for which the cross sections pass through a minimum at an energy near 250 eV and increase rapidly beyond the minimum out to 5 keV.