Abstract
An expression for transition probability for rotational-translational energy transfer for polar molecules has been derived, using the distorted wave approximation. The polar molecules have been assumed as point dipoles imbedded in hard cores. Calculations have been performed for the transition (1 → 0, 1 → 0) for HCl, DCl, HBr, H2O, H2S, and NH3 at various temperatures (300–500 °K). The calculated (Zrot)10 values are in good agreement with experimental (Zrot)eff data. Further, the theory predicts decrease of (Zrot)10 with increase in temperature, dipole moment, and moment of inertia. The temperature dependence is thus opposite to that predicted by the classical theory of Zeleznik, but agrees well with the dependence of (Zrot)eff obtained from experimental thermal conductivity data.
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