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The gas-phase reaction of $\mathrm{O}+\mathrm{H}_3^+$ has two exothermicproduct channels, $\mathrm{OH}^+ +\mathrm{H}_2$ and $\mathrm{H}_2\mathrm{O}^++\mathrm{H}$. In the present study, we analyze experimental data from amerged-beams measurement to derive thermal rate coefficients resolved byproduct channel for the temperature range from 10 to 1000 K. Publishedastrochemical models either ignore the second product channel or apply atemperature-independent branching ratio of 70% vs. 30% for the formation of$\mathrm{OH}^+ +\mathrm{H}_2$ vs. $\mathrm{H}_2\mathrm{O}^+ +\mathrm{H}$,respectively, which originates from a single experimental data point measuredat 295 K. Our results are consistent with this data point, but show a branchingratio that varies with temperature reaching 58% vs. 42% at 10 K. We providerecommended rate coefficients for the two product channels for two cases, onewhere the initial fine-structure population of the O$(^3P_J)$ reactant is inits $J=2$ ground state and the other one where it is in thermal equilibrium.

Branching ratio for $\text{O}+\text{H}_3^+$ forming $\text{OH}^+ +\text{H}_2$ and $\text{H}_2\text{O}^+ +\text{H}$