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A strong alternation of Auger electron angular distributions is observed for the second-step Auger emission of Ar following 2p 3/2 4s and 2p 1/2 4s excitation. This effect, which gives rise not only to anisotropy suppression but also to the strong enhancement, is shown to originate from a coherent population of the Auger initial state due to the short decay time of the second-step Auger transition, the so-called lifetime interference effect.
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Ueda et al. (1999) studied this question.
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