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- Title
Doubly Excited <sup>1,3</sup> P<sup>e</sup> Resonance States of the Positronium Negative Ion with Coulomb and Screened Coulomb Potentials.
- Authors
Kar, Sabyasachi; Ho, Y.
- Abstract
We have investigated the doubly excited 1,3 Pe resonance states of positronium negative ion with Coulomb and screened Coulomb potentials using highly accurate correlated exponential wavefunctions. For Coulomb interaction, the stabilization and the complex-rotation methods are employed to extract resonance parameters (resonance positions and widths). We have obtained two 1 Pe resonances and three 3 Pe resonances below the n = 3 Ps threshold. In addition to Feshbach resonances lying below n = 3 Ps threshold, we have calculated one 3 Pe shape resonances lying above the Ps ( n = 2) threshold. For screened Coulomb (Yukawa) interaction, we employ the stabilization method to extract resonance parameters as functions screening parameter. The resonance energies and widths for 1,3 Pe resonance states of Ps− below the n = 3 Ps threshold for different screening parameters ranging from infinity (Coulomb case) to small values are reported, along with the Ps(3S) and Ps(3P) threshold energies. The screened Coulomb results for the 1,3 Pe resonance states are reported for the first time in the literature.
- Subjects
RESONANCE; ELECTRIC fields; COULOMB potential; NUCLEAR reactions; POSITRONIUM
- Publication
Few-Body Systems, 2009, Vol 46, Issue 3, p173
- ISSN
0177-7963
- Publication type
Article
- DOI
10.1007/s00601-009-0055-2