Theoretical Study On Many-Body Ions Of Isotope Shift Effects And Transition Properties

Aimed at precise measurements of the nuclear mean-square charge radii,the identi-fication of the observed spectra and the plasma diagnostic process in the celestial bodies as well as the laboratory equipment,theoretical calculations of the atomic structure can provide much reliable parameters.On the one hand,it can boost the development of oth-er theories.On the other hand,it can also lighten the direction for the progress of the experiment.In this thesis,isotope shift factors or transition rates of two isoelectronic se-quences are calculated in the framework of the Mutli-configuration Dirac-Hartree-Fock method.Electron correlation effects,Breit interaction and QED effects are systemically considered in GRASP2K code.Three main works are listed here.1.Isotope shift factors for 2s2p^3,1P₁-2s^{2 1}S₀transitions in B II are presented in the text.With all-order correlations including,it is proved that Breit interaction has tiny contribution.Along with the expansion of the configuration space,a linear correlation relation between the mass shift factors and the energies for the transitions concerned was found.And the estimating the uncertainty in the calculation of isotope shift factors was verified in this relation.2.Based on the results of B II,author considered the relativistic effects.Isotope shift factors for 2s2p^3,1P₁-2s^{2 1}S₀transitions in highly charged Be-like ions are pre-sented omitting the high-order correlations.Author found that Breit interaction and the leading QED effects have large contributions.Besides,the relative values of the relativis-tic correction term in mass-shift factors are quite large in this sequence.And the results show that the contributions of Breit interaction and the leading QED effects are larger on relativistic correction terms than the one on non-relativistic term.3.Magnetic dipole and electric quadrupole transition probabilities of the 3d²D_3/2-3d²D_5/2transition in the K-like sequence with 26 Z 36 are investigated.The most im-portant first-order correlations are found when comparing the electron-pair contributions.The final results are in good agreements with experiments considering the correlations,Breit interaction and QED effects systemically.And the results show that line strength is extremely insensitive to these three effects in M1 transition of the fine-splitting structure.Moreover,considering the quality factor,Cu¹⁰⁺and Zn¹¹⁺are recommended as promising candidates of new generation HCIs clock.