Exchange scattering has been directly observed in the excitation of the 6³P state of mercury by measuring the spin flip of polarized electrons. Between threshold and 8 eV exchange scattering dominates, resulting in a reversal of the direction of polarization of the scattered electrons. Above 8 eV the influence of exchange decreases rapidly for scattering in the forward direction.
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Hanne et al. (1974) studied this question.
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