Transport Coefficients for a Diatomic Gas

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Abstract
The transport coefficients in the Wang Chang and Uhlenbeck theory are calculated for a gas of rigid rotators in which the coupling between rotational and translational modes is very weak (hydrogen). Each molecule has a scattering center at both extremities, and from this, and the Born approximation a differential scattering cross section is derived for arbitrary encounters. When a delta potential is introduced between each “nuclear” pair, the result is a stronger temperature dependence of viscosity than that shown by a classical gas of hard spheres.

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