On the Vibration–Rotation Energy Transfer of Fast Rotating Molecules

A semiclassical theory of the vibration–rotation energy transfer of fast rotating molecules is presented. The formulation is based on the same model as that of Shin's classical theory. The semiclassical theory is simpler to derive and more rigorous. We show that it necessarily gives more accurate results than the classical theory. Applications to the systems HF and DF indicate that the two theories agree reasonably well in these cases.