A pair of generalized coordinates is introduced to describe Wannier threshold effects in three- and four-particle systems. In the case of four-particle breakup, they indicate the presence of multiple unstable normal modes in the breakup configuration and thus reveal a new feature in the Wannier formalism: the occurrence of a secondary Wannier power law. This prediction is in accord with recent experimental observations of a break in the cross section near threshold for triple photoionization in oxygen and in neon.
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Feagin et al. (1990) studied this question.
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