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Various criteria that have been suggested for assessing the accuracy of complex‐coordinate eigenvalues are critically tested in an application to the lowest helium 1 S resonance, and found to be relatively ineffective. An alternative criterion is described, based on a generalized stabilization procedure, which seems better able to select the “best” resonance eigenvalue and to guide the construction of variational trial functions.
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Moiseyev et al. (1980) studied this question.
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