Variation of the predicted abundance ratios [HOC+]/[H2O], [HCO+ ]/[H2O], and [CF+]/[HF] as functions of the fraction of molecular gas f(H2) and thekinetic temperature. The plot uses Langevin rates for reactions between ions and polar molecules with the molecular data listed 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 yellow contour in the top left box indicates the mean observed ratio [HOC+ ]/[H2O] = 1.8 × 10−3. The mean values of the abundance ratios are listed in Table 5.
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