A quantum mechanical expression for the relaxation time is obtained for a low density gas of rotating diatomic molecules. The development is based on the restricted distorted wave approximation to rotationally inelastic scattering. The particular case of a gas of rigid spheres with embedded point dipoles is discussed. The classical limit of this result is also determined and agrees with the result obtained by another method.
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Olmsted et al. (1971) studied this question.
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