Full-Relativistic Study On Electron Structure Of O~+Ion And Z=119Atom

Precise atomic data is of important application in divers physical researches, for example, which can be used to diagnose the electron densities of planetary nebulas in astronomy, or to diagnose elements in ICF research. Large number of data will be needed in these researches. It is impossible to obtain such amount of data only by experiments, and theoretical calculation will play an irreplaceable role here. In this paper, we use a GRASP-JT code to construct quasicomplete bases by DF calculation and MCDF-SCF calculations. With quasicomplete bases we can carry out precise calculations for atom systems. Relativistic effects, electron correlations, Breit interaction and QED effect are important for precise atomic data calculations, and must be carefully deal with.Based on a set of quasicomplete bases, we calculate the forbidden transition rates of the O+ground state considering the electron correlation, Breit interaction and QED corrections. The process of convergence in calculation is studied as well. Our calculations demonstrate that the Breit interactions are most important among all the QED corrections. Our results agree well with different experiments. The uncertainty of E2and M1transition rate of2D5/2,3/2→4S3/2is about2.5%. A ratio value for the two transitions in the limit of high-electron-density is given as r(∞)=0.363±0.009. We give a qualitative explanation from the physical picture for an interesting phenomenon that forbidden transition rates of different fine structure levels belonging to the same LS term can differ by2orders.We study the electron structure of z=119atom in addition. z=119is the biggest atomic number, and have not been obtained in experiment. The electron structure of this atom is one electron adding to a closed shell, which leads to fierce conflict of5 orbitals(5g,6f,7d,8s,8p). Our calculations find that the8s orbital has the lowest energy,so the ground state configuration of z=119atom is8s.