Variation of the predicted abundance ratios [HOC+]/[H2O], [HCO+ ]/[H2O], and [CF+]/[HF] as a functionof the fraction of molecular gas f(H2) and the kinetic temperature. The plot is using enhanced capture rates for reactions between ions and polar molecules using the formalism and the molecular data described by Woon & Herbst (2009) and the new theoretical reaction rate for reaction R5 (Denis-Alpizar et al. 2018). Contour levels are set at 2 × 10−3, 4 × 10−3, 8 × 10−3,... up to 128 × 10−3. The mean values of the abundance ratios are listed in Table 5.
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