Vibrational-rotational energy transfer in collisions of HF (v = 4, J = 20) with rare gases

State-to-state energy transfer cross sections for He and Ne+HF(v = 4, J = 20) at 0.2 eV initial relative translational energy were computed using quasiclassical trajectories. These results are compared with previously published results for Ar+HF at the same initial conditions. The results show that the number of final J states populated in a given final v state increases and that the magnitudes of the state-to-state cross sections decreases as the size of the rare gas atom decreases. The cross sections for vibrational transitions are not sensitive to the size of the rare gas atom