Theoretical Study On K-and L-shell Electron Collision Process Of Highly Charge Ions And Subsequent Radiative Decay

There are a large number of important physical parameters which reflect the information of ion structure in the ionized state ion radiation spectrum.These physical parameters are closely related to the atomic process,especially the collision process.In addition,these high precision physical parameters play an important role in the simulation and diagnosis of plasma.With the development of experimental techniques,numerous radiation spectra have been observed in experiment.By further studying these observed radiation spectra,the anisotropic electron energy distribution,temperature and density of the plasma can be obtained,and use these parameters to diagnose plasma.In this thesis,by using the Grasp program which is based on the Multi-configuration Dirac-Fock?MCDF?and the FAC program which is based on the relativistic configuration interaction method,we detailedly investigated hydrogenlike,heliumlike and boronlike electron collision process of highly charged ions and subsequent radiative decay.The following work was carried out in detail:1.For the aspect of electron impact excitation of highly charged ions,we have studied the influence of Breit interaction on total cross section and the linear polarization of radiation following electron-impact excitation of Boron isoelectronic sequence.It is found that the Breit interaction strongly influences the electron impact excitation cross section and the linear polarization of the radiated photons.It is very different from the conclusions for the linear polarization of the same radiations but formed by the dielectronic recombination process,in which the Breit interaction has no effects on linear polarization[Phys.Rev.A 91,042705?2015?].2.The flexible atomic code was employed to simulate the dielectronic recombination and electron impact excitation rate coefficients of hydrogenlike S¹⁵⁺and heliumlike S¹⁴⁺ions,and calculated rate coefficients of the dielectronic recombination process for hydrogenlike and heliumlike silicon.The centroid energy of resonance peaks and the excitation energy for S¹⁵⁺and S¹⁴⁺ions are compared with the existing experimental and theoretical results.It is found that the errors are all within 1%.Similarly,the theoretical simulation and experimental results of the rate coefficient are also reflected a good consistency.It should be noted that this is firstly distinguished the two atomic processes for the same ion from the energy view.