Optimized Relativistic Many-Body Perturbation Theory Calculation of Wavelengths and Oscillator Strengths for Li-like Multicharged Ions

2019 ◽  
pp. 223-251 ◽  
Author(s):  
Olga Yu Khetselius
Keyword(s):  
Perturbation Theory ◽  
Oscillator Strengths ◽  
Many Body ◽  
Many Body Perturbation Theory ◽  
Theory Calculation

scholarly journals RELATIVISTIC CALCULATION OF WAVELENGTHS AND E1 OSCILLATOR STRENGTHS IN Li-LIKE MULTICHARGED IONS AND GAUGE INVARIANCE PRINCIPLE

2021 ◽  
pp. 134-142
Author(s):  
O. Khetselius ◽  
A. Mykhailov
Keyword(s):  
Perturbation Theory ◽  
Invariance Principle ◽  
Gauge Invariance ◽  
Oscillator Strengths ◽  
Relativistic Energy ◽  
Many Body ◽  
Zeroth Order ◽  
Many Body Perturbation Theory ◽  
Precise Experiment ◽  
Particle Approximation

The spectral wavelengths and oscillator strengths for 1s22s (2S1/2) → 1s23p (2P1/2) transitions in the Li-like multicharged ions with the nuclear charge Z=28,30 are calculated on the basis of the combined relativistic energy approach and relativistic many-body perturbation theory with the zeroth order optimized Dirac-Kohn-Sham one-particle approximation  and gauge invariance principle performance. The comparison of the obtained results with available theoretical and experimental (compilated) data is performed. The important point is linked with an accurate accounting for the complex exchange-correlation (polarization) effect contributions and using the optimized one-quasiparticle representation in the relativistic many-body perturbation theory zeroth order that significantly provides a physically reasonable agreement between theory and precise experiment.

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