Abstract
A resonance state with three equivalent electrons and one proton has been identified. Large-scale calculations have been performed using the complex-rotation technique, and the results indicate that the investigated $^{4}\mathrm{S}^{\mathrm{o}}$ state of ${\mathrm{H}}^{2\mathrm{\ensuremath{-}}}$ is strongly correlated. The findings are rationalized by comparing with bound doubly charged anions, isoelectronic states of the Li atom, and calculations in the infinite-dimension limit. In addition, the emerging picture is sustained by an analysis of the complex-rotated wave function.
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