Influence of vibrational and translational energies on energy transfer in Ar+HCl (J = 0, 2, 6, and 12)

The influence of initial relative translational energy on pure-rotational energy transfer in various vibrational states of HCl in collisions with Ar has been studied by using quasiclassical trajectory calculations and a model potential-energy surface. The vibrational states v = 0, 3, and 6 and initial rotational states Ji = 0, 2, 6, and 12 were studied over the collision energy range 0.1 to 1.0 eV. The results show that pure-rotational energy transfer is not, in general, a strong function of the vibrational state in which the energy transfer takes place. It is found that there is a difference in the dependence of the cross section on the initial relative translational energy for low Ji and high Ji.