Abstract
The rotational excitation of HCN by collision with H2 has been investigated using the semiclassical exponential approximation. The interaction potential between HCN and H2 has been carefully constructed by taking into account the various types of intermolecular forces including the short-range repulsive force. The inelastic transition probabilities and cross sections have been calculated for different rotational states of the two molecules and over a limited range of energy. For simplicity, the simultaneous excitation of the H2 molecule has not been considered. The results show interesting features of the strong-coupling interaction and the effects of the different factors influencing the rotational transitions in molecule-molecule collisions.
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