Theoretical Study On Precision Atomic Spectroscopy Of L-shell High Charge State Ions

Accurate atomic spectral parameters can be used to identify spectral lines in astrophysical and laboratory plasmas as well as for modeling and diagnosing of plasmas.In this paper,two-state-of-the-art fully relativistic methods,the multiconfiguration Dirac-Fock(MCDF)method and the many-body perturbation theory(MBPT)method are used to calculate level structures and transition characteristics of nitrogen-like Se ??? and nitrogen-like Sr ???.A high-precision database of the atomic spectral parameter is established.This paper mainly includes:First,theoretical studies on atomic spectral parameters such as excitation energies,lifetimes,transition rates and hyperfine structure constant of nitrogen-like Se ???.In this work,using the multiconfiguration Dirac-Fock(MCDF)and subsequent relativistic configuration interaction(RCI)method implemented in the GRASP2K package as well as the many-body perturbation theory(MBPT)method implemented in the FAC package,highly accurate calculations are performed for the lowest 316 fine-structure levels arising from the 2s22p3,2s2p4,2p5,2s22p231(1=s,p,d),2s2p331(1=s,p,d),2p431(1=s,p,d)and 2s22p241(1=s,p,d,f)configurations in nitrogen-like Se ???.Complete and consistent atomic spectral data,including excitation energies,lifetimes,hyperfine structures constant,lande gJ factors,and Electric dipole(E1),Magnetic dipole(M1),Electric quadrupole(E2),Magnetic quadrupole(M2)wavelengths,transition rates,line strengths,and oscillator strengths among these 316 levels are obtained.Comparisons are made between the present two data sets,as well as with the other available experimental and theoretical values.The present calculations provide a complete,consistent,and accurate data set for line identification and modeling purposes,which can also be considered as a benchmark for other calculations.The present data are accurate enough for identification and deblending of emission lines involving the n=3,4 levels,and are also useful for modeling and diagnosing fusion plasmas.Our present data show that some previously measured lines of nitrogen-like Se ??? are affected by large errors for some transitions,and should be remeasured.Second,theoretical studies on atomic spectral parameters such as excitation energies,lifetimes,transition rates and hyperfine structure constant of nitrogen-like Sr ???.In this work,using the multiconfiguration Dirac-Fock(MCDF)and subsequent relativistic configuration interaction(RCI)method implemented in the GRASP2K package as well as the many-body perturbation theory(MBPT)method implemented in the FAC package,highly accurate calculations are performed for the lowest 272 fine-structure levels arising from the 2s22p3,2s2p4,2p5,2s22p231(1=s,p,d),2s2p331(1=s,p,d)and 2p431(1=s,p,d)configurations in nitrogen-like Sr ???.Complete and consistent atomic spectral data,including excitation energies,lifetimes,hyperfine structures constant,lande gJ factors,and Electric dipole(E1),Magnetic dipole(M1),Electric quadrupole(E2),Magnetic quadrupole(M2)wavelengths,transition rates,line strengths,and oscillator strengths among these 272 levels are obtained.Comparisons are made between the present two data sets,as well as with the other available theoretical values.The present calculations provide a complete,consistent,and accurate data set for line identification and modeling purposes,which can also be considered as a benchmark for other calculations.The present data are accurate enough for identification and deblending of emission lines involving the n= 3 levels,and are also useful for modeling and diagnosing fusion plasmas.