Rapid convergence of V–V energy transfer calculated using adiabatic basis functions. I. An accurate two-state model for low-energy resonant V–V energy transfer. II.

We report a series of calculations designed to show the efficiency of adiabatic basis sets for V–V energy transfer in diatom–diatom collisions. We do find that these basis sets are very efficient for both symmetric and nonsymmetric cases. For resonant V–V energy transfer at low energies we obtain quantitative accuracy with a two-state model. The only dynamical calculations required for this model are two phase shifts.