Theoretical Studies On Polarizations Of Radiative Lines Formed By Electron Collision Processes Of Highly Charged Ions

Highly charged ions play a very significant role in many collisional and radiativeprocesses occurring in all kinds of plasma environments. The subject, named thephysics of highly charged ions, is always one of the most active and interesting fieldsin modern atomic physics. The spectral lines radiated by highly charged ions containmany important parameters reflecting plasma information, and linear degree ofpolarization is a significant one. In this work, by using the fully relativistic programsREIE06and REDR05which are used to study the electron impact excitation （EIE）and dielectronic recombination （DR） processes, respectively, developed on the basisof multi-configuration Dirac-Fock （MCDF） method and relevant programs GRASP92and RATIP, we detailedly studied the linear polarizations of spectral lines radiatedfrom highly charged ions in the electron collisional processes （such as, EIE and DR）,which can be used to recognize the formation mechanism of spectral lines anddiagnose all kinds of plasma environments.In this thesis, a brief introduction about some basic concepts and researchbackground of this work has been given in chapter1. Furthermore, chapter2described the MCDF method and the theory of EIE and DR processes. In chapter3,with the utilization of the fully relativistic distorted-wave （RDW） program REIE06,we systematically studied the influence of Breit interaction on the linear polarizationof electric dipole lines1s2s²2p_1/2J=1â†'1s²2s²J=0following inner-shell electronimpact excitation of highly charged berylliumlike Mo³⁸⁺, I⁴⁹⁺, Nd⁵⁶⁺, Ho⁶³⁺, W⁷⁰⁺,Bi⁷⁹⁺, and U⁸⁸⁺ions. It is found that the Breit interaction makes the linear polarizationof radiations decrease, and this character becomes more evident with increasing ofincident electron energy. It is also found, for a given impact energy, that the linearpolarization without the Breit interaction included increases very slowly as the atomicnumber increases, however, the linear polarization with the Breit interaction includeddecreases rapidly. In chapter4, we studied the linear polarization of spectral lines5fâ†'3d formed by the EIE and DR processes of highly charged copperlike toseleniumlike Au ions, by using the fully relativistic programs REIE06and REDR05used to research the EIE and DR, respectively. We find that the linear polarizations ofthe same line formed by the EIE and DR processes are very different, so the linear polarization can be used to recognize the formation mechanism of spectral lines.Finally, some conclusions and prospects of future work have been given in chapter5.