Charge transfer of ${\mathrm{Ar}}^{+}$ + ${\mathrm{N}}_2$⇄${\mathrm{N}}_2^{+}$ + Ar at near thermal energies

In a drift experiment, results have been obtained on the energy dependences of the rate coefficients for the forward and reverse reaction ${\mathrm{Ar}}^{+}\left({}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}\right)+\mathrm{N}\underset{k_r}{\stackrel{k_f}{\rightleftarrows }}\mathrm{Ar}+{{\mathrm{N}}_2}^{+}$ ($v=0\mathrm{}$ and $v\ne 0$). The forward reaction predominantly proceeds via an endoergic channel, resulting in the ionic product ${{\mathrm{N}}_2}^{+}(X,v\ne 0)$, and $k_f$ increases from 1×${10}^{-11\mathrm{}}$ ${\mathrm{cm}}^3$ ${\sec }^{-1\mathrm{}}$ to 7×${10}^{-10\mathrm{}}$ ${\mathrm{cm}}^3$ ${\sec }^{-1\mathrm{}}$ in the energy range from thermal up to ${\mathrm{E}}_{\mathrm{c}.\mathrm{m}}$ ∼3 eV. In the reverse direction the reaction is fast in the entire energy range investigated (a few tenths of an eV up to about 6 eV) for vibrationally excited ${\mathrm{N}}_2^{+}$, for which the reaction is exoergic, but it shows a strong energy dependence in the case of ${{\mathrm{N}}_2}^{+}\mathrm{}(v=0\mathrm{})\mathrm{}$, reflecting the endoergicity of this reaction path.