Charge transfer in slow collisions of ${\mathrm{C}}^{4+}$ with H below 1 keV/amu

We reexamined charge-transfer cross sections for ${\mathrm{C}}^{4+}+\mathrm{H}$ collisions for energies from 1 meV/amu to 1 keV/amu using the recently developed hyperspherical close-coupling method. Our results agree with several previous theoretical calculations using molecular-orbital expansion. However, these converged theoretical predictions do not agree with total cross sections from the merged-beam experiments.