A model for post-collision interaction is introduced, emphasizing the adiabatic Stark mixing of autoionizing target states in the field of the receding projectile ion. Parity is destroyed as a good quantum number for the Stark-mixed states. As a consequence the angular distribution of the autoionization electrons exhibits deviation from 90^∘{} symmetry. Recent experiments on the He 2s2p¹P and 2p²¹D states excited by 10-keV Li⁺ confirm this result.
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Stolterfoht et al. (1979) studied this question.
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