Abstract
Destabilization of atomic anions is studied for the ground1S and first excited state 3P of theten-electron system. Using large and diffuse basis sets,configuration-interaction calculations show that for decreasingnuclear charge Z the ground state 1S is absorbedinto the continuous spectrum at the critical parameter valueZc(1S) ≈ 8.74 e0, and thetriplet state at Zc(3P) = 9e0. This implies instability of the di-anion O2-and excludes existence of stable excited bound states ofF-. The numerical results give strong evidence of differentabsorption mechanisms into the continuum for 1S and3P, involving zero-energy threshold bound or virtualstates, respectively. Arguments from the rigorous theory ofSchrödinger operators lead to the expectation that the observedphenomena are manifestations of more universal properties common toall anionic systems.
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