The ground 2Σg state of the Be−2 anion is predicted to be stable with respect to electron loss and dissociation, with a vertical electron detachment energy at Re=4.62 a.u. of 0.29 eV. The Be−2 potential curve is found to cross the repulsive Be2 curve near 5.8 a.u., which corresponds closely to the outer turning point of the v=3 vibration of Be−2.
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Jordan et al. (1976) studied this question.
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