Abstract
Theories of light-induced drift in gaseous mixtures have so far disregarded the alignment of angular momentum produced in optical excitation. The error caused thereby is estimated in terms of a first-order perturbation in non-sphericity of the intermolecular interaction. For transitions with Delta J=0 the result is not likely to exceed the order of 1% of the unperturbed drift velocity, which is below the experimental error margin. On the other hand, for Delta J=+or-1 and small J, a much larger influence for the alignment must be expected. The formalism also leads to an estimate for the precession effect caused by a magnetic field. In case of Sigma to Pi excitations of diamagnetic diatomic molecules this effect may become relatively strong.
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