Charge exchange in C$^{5+}$ + H collisions

Charge exchange between the solar wind ion C$^{5+}$ and neutral interstellar hydrogen is thought to contribute to the heliospheric component of the soft x-ray background, as the highly charged resultant C$^{4+}$ ion emits an x-ray photon through the electron's cascade to the ground state. Accurate state-specific electron capture cross sections are therefore a vital ingredient in the modeling of this diffuse emission. In this study, we calculate $n-$, $l-$, $S$-resolved cross sections for capture into the dominant $n=3$, 4, 5 manifolds for both singlet and triplet states, over a range of collision energies 0.01-50 keV/u, using the fully quantal molecular orbital close coupling method. We include a comparison with results obtained through classical trajectory Monte Carlo, multichannel Landau-Zener, atomic orbital close, coupling, and merged-beams total cross section measurements.