The simplified quantum model, originally proposed for collisions with hydrogen, is extended to the case of collisions of different atoms $B+A$ and their ions $B^{+}+A^{-}$. It is shown that the simplified model correctly reproduces experimental data on relative populations of oxygen states in low-energy collisions of ${\mathrm{O}}^{+}$ with ${\mathrm{P}}^{-}/{\mathrm{D}}^{-}/{\mathrm{C}}^{-}/{\mathrm{Si}}^{-}/{\mathrm{O}}^{-}/{\mathrm{S}}^{-}$. The simplified quantum model may be very useful for physically reliable qualitative and quantitative estimations of rate coefficients values of inelastic processes in atom-atom and cation-anion collisions, which are needed for numerical modeling of plasma and gaseous media with temperatures below $\approx 10000\mathrm{K}$. Predictions of the simplified model for ${\mathrm{O}}^{+}+{\mathrm{Na}}^{-},{\mathrm{Li}}^{-},{\mathrm{Ni}}^{-},{\mathrm{I}}^{-},{\mathrm{F}}^{-},{\mathrm{Cl}}^{-}$ low-energy collisions are presented. The equation for the position of the optimal window maximum with respect to the electron binding energy is derived and presented.

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• Atomic & molecular collisions
• Chemical reactions
• Scattering of atoms, molecules, clusters & ions