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We have observed resonant excitation of swift channeled hydrogenlike ions ($Z=5$ to $Z=9$) and heliumlike F⁷⁺ which arises from a coherent periodic perturbation by the atoms in the bounding crystal rows. The resonance excitation was seen through the reduction in the transmission of fixed-charge-state ions through channels in thin crystals of Au and Ag.
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Datz et al. (1978) studied this question.
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