Abstract
Doubly excited intrashell resonance states of positronium negative ion, Ps associated with the N54 and N55 thresholds of Ps atom are calculated using the method of complex-coordinate rotation. Products of Slater-type orbitals are used to represent the two-electron wave functions. All possible intrashell states with angular momenta up to L56 and L58 for N54 and N55 thresholds, respectively, have been identified. Supermultiplet structures showing the rotational and vibrational character of the doubly excited resonance states of Ps are constructed.
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