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A continuum state of two electrons with momenta k 1 and k 2 can be represented as a linear combination of two-electron states with quantum numbers L, M, S and pi . Conditions are derived for which a given LMS pi state gives a vanishing contribution to the population of a state of given k 1 and k 2 in an arbitrary process leading to a two-electron continuum state.
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Maulbetsch et al. (1995) studied this question.
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