White-light-induced drift in cylindrical and spherical geometries

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Abstract
White-light-induced drift is a process whereby white light can separate species in a gas mixture. The effectiveness of the process is determined by the competition between the increasing velocity selectivity of excitation and the loss of excitation as the propagating light is absorbed and reemitted. We show that the divergence of real light sources affects this competition and find conditions relating source dimensions and densities for which the white-light-induced drift effect should be strong. Geometries with cylindrical and spherical symmetries are considered.