Kinetics of the reactions of $N2+$ with $CO2$ and $SO2$ from 300–1400 K

Rate constants and branching ratios have been measured for the reactions of $N2+$ with $CO2$ and $SO2$ in a high-temperature flowing afterglow from 300–1400 K. The rate constants have also been measured as a function of kinetic energy in a selected ion flow drift tube at 298 K for the reaction of $N2+$ with $CO2.$ The rate constants for the reaction of $N2+$ with $CO2$ in the selected ion flow drift tube (SIFDT) and high temperature flowing afterglow (HTFA) both decrease monotonically with increasing energy. The rate constants at high temperatures have a large fraction of the available energy in internal energy (rotational and vibrational). Compared to the SIFDT rate constants with most of the energy in translation, internal energy hinders the reactivity more than translational energy. The rate constants for the reaction of $N2+$ with $SO2$ also decrease with increasing energy up to around 0.4 eV. The rate constants increase above 0.4 eV when an endothermic dissociative charge-transfer channel forming $SO+$ becomes important. Comparing the HTFA results with previous flow drift tube measurements shows that translational, rotational, and vibrational energy affect the reactivity identically at low energy where the $SO2+$ channel dominates. It appears that $N2+$ vibrational excitation is mainly responsible for the $SO+$ channel, consistent with a previous study. The results for the $N2+$ reactions are compared to the energetically similar reactions of $Ar+$ with $CO2$ and $SO2.$