Relativistic Theoretical Study On The Dielectronic Recombination

Electron-ion collision is a basic process in atomic physics. Dielectronic recombination (DR) processes are one of important inelastic phenomenon of electron-ion collision, which widely exists in as astronomy and laboratory plasmas. Accurate data about DR process, such as strengths, cross sections and rate coefficients, is very important parameters when one simulate and diagnose all kinds of plasmas and develop X-ray laser. In this thesis, DR processes of Cu ion of sodium-like, Mg and Al ions of helium-like, Sn and W ions have been analyzed by using quasi-relativistic Hatree-Fock (HF), Multiconfiguration Dirac-Fock (MCDF) and relativistic configuration interaction (CI) methods, respectively, which mainly include:Firstly, using the quasi-relativistic HF method, DR and resonant transfer excitation (RTE) cross sections have been calculated by considering configuration interaction effects, and the dominant channels for DR process have been analyzed. DR resonant strengths from Cowan and FAC codes are compared. RTE cross sections between Cu18+ ion and H2 molecular have been calculated and made comparisons with the observed experimental results.Secondly, using the Multi-configuration Dirac-Fock method, we calculate the DR cross sections of Mg and Al ions of helium-like and analyze the structures of high-n dielectronic satellite lines and their influences for Kαresonant lines of Mg and Al ions of helium-like. Comparisons have been made for the wavelengths of dielectronic satellite lines, which based on the Grasp92 and FAC codes.Thirdly, using the FAC code, we analysis the influences of all kinds of factors for DR rate coefficients of Sn12+ ion. Based on the analysis results, DR coefficients of Sn12+ ion for n = 4-15 and DR coefficients of eight ionized stages from 4d excited electron of Sn elements have been calculated. Comparisons have been made for the DR rate coefficients, radiative-recombination (RR) rate coefficients and three-body recombination rate coefficients.Finally, based on the conclusions of DR process of Sn12+ ion, the important channels for DR processes of W37+ and W36+ ion have been analyzed by using the FAC code. DR coefficients of the quantum number, n, from 4 to 15 have been calculated.In summary, we study the DR processes of Cu, Mg, Al, Sn and W elements in astronomy, laboratory and ITER plasmas, respectively. Up to now, for DR processes of such complex structures for Sn and W, such as 3l184s24p64dn, few experimental or theoretical result has been reported to their DR processes. So we hope that the results obtained in our work can be helpful to their applications and has the contribution to research DR processes of complex structures of complex ions.