Abstract
The dynamics of the dissociative charge exchange process AB+CD +→A ++B+CD is investigated, extending previous coupled-wavepacket studies of dissociative and non-dissociative charge exchange in ion-molecule collisions to the case where both collision partners are diatomic species. Here too, the treatment makes use of a semiclassical approximation whereby the relative motion between the two molecules evolves along a classical trajectory, whereas the vibrational motions of the two molecules are treated quantally. The associated wavefunctions are defined over a two-dimensional grid and their time evolution is handled numerically. In order to put forward the basic characteristics of charge exchange processes, a very simple model case has been investigated in the frame of the impact parameter approximation. The model provides physical insight into the dynamics of the process, especially in the intermediate energy domain where the non-adiabatic transitions are neither vertical nor horizontal. At high and low collision energies, the results can be directly compared to the atom-diatom case; at intermediate energies, specific effects are found which reveal an influence of the vibrational movement of CD on the probability of dissociation of the AB molecule.
Published Version
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