Highly Charged Ions The Theoretical Study Of Dielectronic Recombination Process

In Atomic and Molecular Physics,the theoretical study for electron-ion collision is an important topic.It is significant in the research of astrophysical plasma,X-ray laser and ICF(Inertially Controlled Fusion),and closely associated with the EBIT (Electron beam ion trap) project in the institute of modern physics of Fudan University.As electron beam energy increasing,more highly charged ions are obtained in EBIT,a full relativistic and detailed study with large-scale configuration interactions(CI) is necessary.Here we present the detailed and systematic study on the dielectronic recombination(DR) for Co-like ions using relativistic distorted wave approximation,including:1,We investigate the different physics effects on DR rate coefficient.(1) The dependence of partial DR rate coefficients on orbital angular momentum l' of the ground state Au⁵²⁺ through each complex series is investigated.(2) The dependence of partial DR rate coefficients of the ground state Au⁵²⁺ on primary quantum number n', without and with the inclusion of DAC transitions,are respectively studied.The results shown that the inclusion of DAC transitions breaks down the n'^-3 scaling law for four complex series of Co-like Au ion.(3) To evaluate the high n' contributions from those complex series for which DR rate coefficients do not scale like n'^-3,the level-by-level extrapolation method including DAC effects is developed.(4) We discussed the CI effects on DR cross section and rate coefficient of Cu-like Au.The detailed calculation and discussion for Co-like Au has been published in Journal of Physics B.Another work for Co-like W has been accepted by Journal of Quantitative Spectroscopy & Radiative Transfer.The discussions of the CI effects on DR process of Cu-like Au has been published in Chinese Physics Letter.2,Systematic theoretical study of DR rate coefficient for the Co-like isoelectronic sequence ions.(1) The dependence of partial DR rate coefficients of different Z Co-like ions through each complex series on orbital angular momentum l',on primary quantum number n' of the captured electron,and the contributions from different core-excitation are discussed.(2) Different fitting methods are used to obtain the dependences of total rate coefficients on the temperature T and atomic number Z for Co-like isoelectronic sequence.(3)We reproduce the DR rate coefficient of Co-like ions from Ge⁵⁺(Z=32) to U⁶⁵⁺(Z=92) with satisfied accuracy by using the fit formula. And this formula is also checked by comparison with the new level-by-level calculations performed independently for the DR rate coefficients of Co-like Gd and Ta.Finally,we compare our calculation with the results of BM approximation,and give some comments on the validaty of BM approximation.The systematic theoretical study for Co-like isoelectronic sequence ions will be submitted to Journal of Physics B.The mainly characteristics in the present work are:(1)we investigate the different effects on the DR rate coefficients,then obtain the results with high accuracy.(2) To evaluate the high n' contributions from those complex series for which DR rate coefficients do not scale like n'^-3,the level-by-level extrapolation method including DAC effects is developed.(3) Obtain the empirical formula which can systematically and rapidly reproduce the DR rate coefficient of Co-like ions from Ge⁵⁺(Z=32) to U⁶⁵⁺ (Z=92) with satisfied accuracy.