Light-induced drift of optically active atoms in a buffer gas is a consequence of the unequal diffusive frictions suffered by the excited and the ground-state atoms. This drift can be used to create an ``optical piston,'' which is best observed when the piston action is confined to a one-dimensional motion. We show that a novel way of realizing this phenomenon is to apply a magnetic field on charged active atoms.
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Dattagupta et al. (1999) studied this question.
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