Abstract
We have investigated the doubly excited 1De resonance states of Ps− interacting with pure Coulomb and screened Coulomb (Yukawa) potentials employing highly correlated wavefunctions. For pure Coulomb interaction, in the framework of stabilization method and complex coordinate rotation method we have obtained two resonances below the n = 2 threshold of the Ps atom. For screened Coulomb interaction, we employ the stabilization method to extract resonance parameters. Resonance energies and widths for the 1De resonance states of Ps− for different screening parameter ranging from infinity (pure Coulomb case) to a small value are also reported.
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