Left panel: variation of the ratio of the HOC+ and H2 O abundance with the kinetic temperature. Each curve represents a different fraction of hydrogen in molecular form f(H2 ) from 0.03 (red) up to 1 (black). Right panel: variation of the ratio of the HOC+ and H2 O abundance with f(H2). Each curve represents a different temperature from 32 K (red) up to 105 K (black). The two panels on the left use enhanced capture rates for reactions between ions and polar molecules using the formalism and the molecular data described by Woon & Herbst (2009). The right panels use the Langevin rates computed from the molecular data listed by Woon & Herbst (2009). The observed N(HOC+)/N(H2O) ratio is 1.8 × 10−3, see Table 5.
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