Using a fully quantum molecular-orbital close-coupling approach with ab initio potentials, we evaluate the dynamical evolution of reaction mechanisms in ${\mathrm{Li}}^{+}+{\mathrm{H}}^{-}$ mutual neutralization across collision energies from ${10}^{-3}$ to ${10}^3\mathrm{eV}/\mathrm{u}$. At lower energies ($\le 0.1\mathrm{eV}/\mathrm{u}$), long-range Coulomb focusing dictates the scattering dynamics, resulting in cross sections that approximately follow an $E^{-1}$ dependence and yield a dominant $\mathrm{Li}\left(3s\right)$ capture channel. In the intermediate regime (0.1 to $10\mathrm{eV}/\mathrm{u}$), coherent multipathway interference generates pronounced Stueckelberg oscillations. Above $10\mathrm{eV}/\mathrm{u}$, short-range interactions within $R<15.0\text{a.u.}$ likely activate additional transition pathways, driving multichannel redistribution toward the $\mathrm{Li}\left(3p\right)$ and $\mathrm{Li}\left(3d\right)$ states. Neglecting these inner-region dynamics underestimates the total cross section by $35\%$ at $1000\mathrm{eV}/\mathrm{u}$. These results reveal the limitations of conventional Landau-Zener descriptions across broad energy regimes and establish a unified quantum picture connecting long-range Coulomb capture, quantum interference, and short-range multichannel state redistribution in mutual neutralization processes.

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• Atomic & molecular collisions
• Atomic & molecular structure
• Charge-transfer collisions
• Potential energy surfaces
• Scattering of atoms, molecules, clusters & ions
• Total cross sections
• Configuration interaction
• Quantum chemistry methods
• Schroedinger equation