A new method of solution of the Boltzmann equation, able to take into account the full anisotropy of the distribution function, is applied to the calculation of swarm parameters in certain reactive gases. The authors first checked the accuracy of the method on the model gas of Lucas and Saelee (1975) where comparisons can be made with results of other authors. Calculations are then carried out with the authors' method in SF6 using three sets of cross-sections available in the literature. The results obtained are compared with those of the standard two-term approximation. It is seen that large differences occur, mainly for the determination of the attachment and transverse diffusion coefficients. Inconsistencies between the three sets of cross-sections used are demonstrated.
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