Calculation of resonance states of positronic lithium atom

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Abstract: Feshbach resonance states of positronic lithium atom are precisely calculated with aGaussian expansion method. By adopting a Lorentzian formula for density of state,resonance energies and widths are systematically determined from series of energy levelscalculated by a real scaling method. We identify Feshbach resonance states between Li(2p)+ e+and Li (4s) + e+thresholds and the results arein good agreement with previous works with the real scaling method and complex scalingmethod. Our results of a dipole series of resonances supported by ion-dipole interactionof Li+-Ps(n = 2),whose existence has been pointed out by previous works, show a good agreement with thelatest calculation with a complex scaling calculation. We point out that an accuracy ofthe model potential for the electron and positron from the atomic ion is significant forthe positronic atom formation process. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish
Article number190
JournalEuropean Physical Journal D
Issue number9
Publication statusPublished - 2016 Sept 1

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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