Calculation of resonance states of positronic lithium atom

Feshbach resonance states of positronic lithium atom are precisely calculated with a Gaussian expansion method. By adopting a Lorentzian formula for density of state, resonance energies and widths are systematically determined from series of energy levels calculated by a real scaling method. We iden...

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Bibliographic Details
Published in:The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2016-09, Vol.70 (9), p.1-9, Article 190
Main Authors: Yamashita, Takuma, Kino, Yasushi
Format: Article
Language:English
Subjects:
Applications of Nonlinear Dynamics and Chaos Theory
Atomic
Dipoles
Lithium
Model accuracy
Molecular
Optical and Plasma Physics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Information Technology
Quantum Physics
Regular Article
Scaling
Spectroscopy/Spectrometry
Spintronics
Topical Issue: Advances in Positron and Electron Scattering
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Summary:Feshbach resonance states of positronic lithium atom are precisely calculated with a Gaussian expansion method. By adopting a Lorentzian formula for density of state, resonance energies and widths are systematically determined from series of energy levels calculated by a real scaling method. We identify Feshbach resonance states between Li (2 p ) + e + and Li (4 s ) + e + thresholds and the results are in good agreement with previous works with the real scaling method and complex scaling method. Our results of a dipole series of resonances supported by ion-dipole interaction of Li + -Ps ( n = 2), whose existence has been pointed out by previous works, show a good agreement with the latest calculation with a complex scaling calculation. We point out that an accuracy of the model potential for the electron and positron from the atomic ion is significant for the positronic atom formation process. Graphical abstract
ISSN:1434-6060
1434-6079
DOI:10.1140/epjd/e2016-70152-3