摘要: A simple expression is derived that relates the rate coefficient for dipole-allowed electron-impact excitation of a molecular ion in Coulomb-Born approximation to Einstein /ital A/ corresponding radiative decay. Results are given several ions astrophysical interest. general analytic obtained equilibrium rotational level populations ground vibrational state any excited by collisions with electrons. The depends only upon electron temperature, density, and constant ion. similar neutral polar molecules.