Abstract

The inverse operator technique for the solution o f the linearized W aldm ann-Snider equation in first order Chapman-Enskog-approximation is used to calculate non-equilibrium rotational angular m om entum polarizations caused by a temperature-or a velocity gradient. The presence o f an external homogeneous m agnetic or electric field is taken into account. In particular, the viscom agnetic vector-and tensor polarization for linear m olecules and the therm oelectric vector-and tensor polarization for polar sym metric top molecules are treated. Detailed expressions are given in term s o f W aldmann-Snider collision cross sections. W hile for the tensor polarizations the self-adjoint part o f the collision operator gives the major contribution, the vector polariza tions occur due to the existence o f a non-selfadjoint part.