Energy Levels and Spectral Lines of Li Atoms in White Dwarf Strength Magnetic Fields

A theoretical approach based on B-splines has been developed to calculate atomic structures and discrete spectra of Li atoms in a strong magnetic field typical of magnetic white dwarf stars. Energy levels are presented for 20 electronic states with the symmetries 20+, 20−, 2(−1)+, 2(−1)−, and 2(−2)+...

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Bibliographic Details
Published in:The Astrophysical journal 2018-04, Vol.856 (2), p.157
Main Author: Zhao, L. B.
Format: Article
Language:English
Subjects:
Astrophysics
atomic data
atomic processes
Atomic spectra
Atomic states
Dwarf stars
Electric dipoles
Electron states
Energy levels
Line spectra
Lithium
Magnetic fields
Oscillator strengths
Stellar magnetic fields
Wavelengths
White dwarf stars
White dwarfs
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Summary:A theoretical approach based on B-splines has been developed to calculate atomic structures and discrete spectra of Li atoms in a strong magnetic field typical of magnetic white dwarf stars. Energy levels are presented for 20 electronic states with the symmetries 20+, 20−, 2(−1)+, 2(−1)−, and 2(−2)+. The magnetic field strengths involved range from 0 to 2350 MG. The wavelengths and oscillator strengths for the electric dipole transitions relevant to these magnetized atomic states are reported. The current results are compared to the limited theoretical data in the literature. A good agreement has been found for the lower energy levels, but a significant discrepancy is clearly visible for the higher energy levels. The existing discrepancies of the wavelengths and oscillator strengths are also discussed. Our investigation shows that the spectrum data of magnetized Li atoms previously published are obviously far from meeting requirements of analyzing discrete atomic spectra of magnetic white dwarfs with lithium atmospheres.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aab4fe