Charge transfer and association ofLi+colliding with Na from very low to intermediate energies

Abstract

The nonradiative charge-transfer processes of ${\mathrm{Li}}^{+}+\mathrm{Na}(3s)$ collisions have been investigated by using the fully quantum-mechanical molecular-orbital close-coupling method and the two-center atomic-orbital close-coupling method for the energy range of ${10}^{\ensuremath{-}4}--2\phantom{\rule{0.16em}{0ex}}\mathrm{keV}/\mathrm{u}$ and $0.2--10\phantom{\rule{0.16em}{0ex}}\mathrm{keV}/\mathrm{u}$, respectively. The radiative charge-transfer, radiative decay, and radiative-association processes have been studied by employing the fully quantum, optical-potential, and semiclassical methods for the energy range of $2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}--110\phantom{\rule{0.16em}{0ex}}\mathrm{eV}/\mathrm{u}$. The nonradiative charge-transfer processes dominate the collisions for energies above 0.2 eV/u while radiative decay processes dominate in the lower-energy region. Especially, we found that the radiative-association process is more important than the radiative charge-transfer process when $E<2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}\phantom{\rule{0.16em}{0ex}}\mathrm{eV}/\mathrm{u}$. The rate coefficients of nonradiative and radiative processes are also given for the temperature range of $3\ifmmode\times\else\texttimes\fi{}{10}^{4}\ensuremath{-}2\ifmmode\times\else\texttimes\fi{}{10}^{9}\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ and ${10}^{\ensuremath{-}6}\ensuremath{-}{10}^{3}\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, respectively.