Abstract
The rovibronic spectra of highly excited Wannier-ridge states of negative helium ions have been calculated within the semiclassical theory, beyond the first-order perturbation theory. A thorough numerical analysis of the stability of classical configuration has been carried out and an estimate of the core electron impact on the lifetime of the resonance states is made. The calculations resolve degeneracies, both with respect to angular momentum and vibrational quantum numbers, which are different from previous analyses. The overall effect of the 1s electron motion on the correlated outer electron motions is found to be negligible.
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