Abstract
General expressions are derived for the transfer of state multipoles in open shell polyatomic–open shell polyatomic rotationally inelastic collisions. These are then used to write expressions for the circular polarizations of spin and rotationally resolved spectral emission lines. Using the distorted wave Born approximation (DWBA), circular polarization ratios are calculated for the specific case of inelastic H+NH2 collisions. The potential is decomposed into a spin-dependent term and an exchange term using tensor methods to facilitate the calculation. Alternatively, the scattering may be considered to take place on singlet or triplet surfaces. An interesting feature of the results is that reorientation appears to be faster on the triplet surface than on the singlet.
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