Theoretical Study On Electron-impact Excitation Of Cd~+ And Highly Charged Boronlike Ions

The electron-impact excitation?EIE? is an important physical progress. The EIE with low charged ions is one of difficult problems in atomic physics, some developed theoretical method or program are very difficult when they are used to deal with the problems of the electron impact excitation with low charged ions. The EIE with highly charged ions is one of hot fields in atomic physics, and it is also a very important progress in plasmas. The high-order effects on the related physical progress of highly charged ions are very important. In the present thesis,we have studied these problems as follows by using the Grasp92 program which is based on Multi-configuration Dirac-Fork?MCDF? and the REIE06 program which is based on relativistic distorted-wave?RDW? method:1.For the aspect of EIE of low charged ions, we have studied the EIE of lower excited state of Cd⁺. In order to discuss the electronic correlation effects, we have studied the effects of valence-valence correlation and core-valence correlation on the total cross section and the polarization of related transition emission line in detail. We find the effects of valence-valence correlation on total cross section are ignorable, while the effects of core-valence correlation on total cross section are very important. Compared with the results of no core-valence correlation, the results of core-valence correlation at least reduce by 15%, especially in low energy range?<10e V?, the results of core-valence are 50% — 67% smaller than the results of no core-valence correlation. However, for the polarization of related transition emission line, the effects of valence-valence correlation and core-valence are very small all.2. For the aspect of EIE 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. The electron-impact excitation?EIE? cross section of 1s²2s22p_1/2 to [(1s²2s²p_1/2)₀2p_3/2]_3/2, [(1s²2s²p_3/2)12p_3/2]_5/2, [(1s²s22p_1/2)₀2p_3/2]_3/2 and [(1s²s22p_1/2)12p_3/2]_5/2 for high charged boronlike Ca15+, Xe49+ and W69+ ions has been calculated by fully relativistic distorted-wave method, meanwhile the corresponding linear polarization has been also obtained. It has been found that the effects of Breit interaction make the EIE cross section increase and such effects on the cross section of 1s excited to 2p is larger than 2s excited to 2p obviously, and for linear polarization, the Breit interaction make the linear polarization of the transition [(1s²2s²p_1/2)₀2p_3/2]_3/2 to 1s²2s22p_1/2 and [(1s²2s²p_3/2)12p_3/2]_5/2 to 1s²2s22p_3/2 decrease, while the Breit interaction make the linear polarization of the transition [(1s²s22p_1/2)₀2p_3/2]_3/2 to 1s²2s22p_1/2 and [(1s²s22p_1/2)12p_3/2]_5/2 to 1s²2s22p_3/2 increase, and this character becomes more evident with higher atom number, which is very different from the conclusions for the linear polarization of the same radiations but formed by the dielectronic recombination process [Phys. Rev. A 91, 042705?2015?], in which the Breit interaction has no effects on linear polarization.