Abstract
The effect of screened Coulomb potentials on the high-lying doubly-excited resonance states of the positronium negative ion has been investigated using the method of complex-scaling together with employing highly correlated Hylleraas-type wave functions. Resonance parameters (resonance energy positions and widths) below the N = 4, 5, and 6 Ps thresholds for various screening parameters are determined.
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