Abstract
We report a new interpretation of vibrational relaxation of molecular ions based on a modified Landau-Teller model. Distorted wave calculations show the relaxation to be dominated by repulsive forces. The ion-induced-dipole forces alter the steepness of the repulsive force and increase the effective collision energy. Incorporating these modifications into the Landau-Teller model correctly predicts the observed dependence of the cross sections on collision energy.
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