  Charge exchange (CX) is a semi-resonant recombination process that can lead
to spectral line emission in the X-ray band. It occurs in nearly any
environment where hot plasma and cold gas interact: in the solar system, in
comets and planetary atmospheres, and likely astrophysically, in, for example,
supernova remnants and galaxy clusters. It also contributes to the soft X-ray
background. Accurate spectral modeling of CX is thus critical to properly
interpreting our astrophysical observations, but the commonly used CX models in
popular spectral fitting packages often rely on scaling equations and may not
accurately describe observations or laboratory measurements. This paper
introduces a method that can be applied to high-resolution CX spectra to
directly extract state-selective CX cross-sections for electron capture, a key
parameter for properly simulating the resulting CX spectrum.
