Theoretical Study On Atomic (Ionic) Fine And Hyperfine Structure

Modern tunable laser,fast ion beams,and ion traps have contributed to the prolifera-tion of high-resolution tools and technique in atomic spectroscopy,which allow meaningful comparisons with theory.On the theoretical side,advances in atomic theory have been greatly enhanced by the advent of powerful and easily accessible computers.Therefore, more precise and more complex atomic structure,properties and related regular can be investigate,and then atomic theories can be further tested and developed.In this thesis,we first introduced the multi-configuration Hartree-(Dirac-)Fock theory. On the basis of this method,we investigate energy-level structures,transition probability and hyperfine structure for complex atoms(ions).Furthermore,we analysed the strong electron correlation effects in atom(ion)and strong relativistic effects in heavy element. The main works included atomic structures and properties of the superheavy element Hs(Z=108)and Uub(Z=112)as well as hyperfine structures of Be-like ions.The atomic properties of the superheavy element Hs(Z=108)and Uub(Z=112)have been studied theoretically in conjunction with the effects of electron correlations and relativistic effects.The atomic structures and the oscillator strengths of low-lying levels have been calculated,and the ground states have also been determined for the singly and doubly charged ions.The results for Uub have been compared with the properties of an element Hg.In order to help experiment measurement the low-lying structures of superheavy elements,some energy levels were suggested to be of good candidates for experimental observations.In the study on hyperfine structure,we computed the hyperfine interaction diagonal and off-diagonal constants of the 1s²2s2p³P_0.1levels,and the effects of electron correlation and Breit interaction on these have been analysed.We hope that these results will be useful for the experimental investigation on the lifetime of 1s²2s2p^ap₀ levels.