CLASSICAL ROTATIONAL CROSS-SECTIONS FOR H-2-HD AND HD-HD COLLISIONS

Classical trajectory calculations of integral cross sections for rotationally inelastic collisions of HD-para H2 and HD-HD were carried out for a wide variety of transitions over a wide range of initial relative translational energies. The results of the HD-H2 calculations were compared with the quantum effective potential calculations of Chu. It was found that the classical method is in reasonably good agreement with the quantum method for the calculation of rotational transitions of HD at the higher initial translational energies, but the classical method is in poor agreement with quantum results for HD excitation at low energies and for H2 excitations at all energies. © 1979.