Kinematic Model for Reaction. III. Detailed Dynamics of the Reaction of Ar+ with D2

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Abstract
The kinematic model for the reaction is extended to the prediction of detailed dynamical properties of reaction: product angular and velocity distributions, differential reaction cross sections, and internal energy distributions. The dynamics of nonreactive scattering are also treated. The model is applied to the Ar++D2↝ArD++D reaction for Ar+ energies of 30, 50, and 75 eV. Good agreement with experiment is obtained. The results imply that in the relative energy range corresponding to several electron volts, the chemical process is dominated by the repulsive core interactions appropriately modified by elastic intermolecular potentials; simple mechanical considerations can characterize the process on this basis. Within the framework of the model, the forward peaking or “stripping” character of the differential reaction cross section is entirely dependent upon the attractive elastic intermolecular potential between receding products; a strongly backward peaked or “rebound” differential reaction cross section is obtained when this potential is not present.