An adiabatic treatment in hyperspherical coordinates is used to predict the existence of resonant structures in Ps^- (Ps denotes positronium) photodetachment. This highly correlated system displays a weak series of narrow Feshbach resonances lying just below the Ps(n=2) threshold, while a single strong shape resonance dominates the photodetachment spectrum above this threshold as in H^-. Use of a "prediagonalized" representation of hyperspherical harmonics dramatically improves the convergence of the adiabatic calculation.
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Botero et al. (1986) studied this question.
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