Theoretical Investigation Of Dielectronic Recombination Process For Rb-like Isolelectronic Sequence

The theoretical study of the collision between electrons and ions has always been a very important topic in the development of atomic and molecular physics,which is closely related to astrophysics,X-ray laser and controllable nuclear fusion.Moreover,the dielectronic recombination?DR?process is a very important process of electron and ion collision,which exists widely in laboratory plasma and celestial body plasma,and plays a crucial role in establishing and maintaining plasma ionization balance and excited ion layout.Accurate DR rate coefficients are of great significance for the diagnosis of dynamic parameters such as plasma temperature and density and the simulation of plasma environment.Dielectronic satellite is an important means of plasma temperature diagnosis,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.We investigate the use of the based on the theory of flexible atomic code?FAC?package,The DR process of Rb-like isoelectronic sequence ions is studied in detail.In order to systematically study,find and summarize the regularity of various effects and DR rate coefficients with atomic number Z,the DR rate coefficients of 15 Rb-like isoelectronic sequences(Mo⁵⁺,Sn¹³⁺,Sb¹⁴⁺,Te¹⁵⁺,Xe¹⁷⁺,Ba¹⁹⁺,Gd²⁷⁺,Tb²⁸⁺,Hf³⁵⁺,Ta³⁶⁺,W³⁷⁺,Re³⁸⁺,Os³⁹⁺,Au⁴²⁺,Hg⁴³⁺)are calculated by FAC package.All levels of the doubly excited states j=?4s¹4p⁶4d¹nln'l'???4s²4p⁵4d¹nln'l'?and?4s²4p⁶nln'l'??n=4,5,6;n'<24;l'<12?are considered and extrapolated to n'=1000.The effects of excitation channel,radiation channel,resonant stabilizing?RS?transition,non-resonance stabilizing?NRS?transition and radiative cascades?DAC?on DR rate coefficients were investigated,and the regularity of various effects was revealed.It is found that with the increase of atomic number Z,and the contribution of DAC effect decreases gradually.When Z=41,the maximum contribution of DAC effect is 79.92%in the whole temperature range.When Z=80,the maximum contribution of DAC effect is 13.46%in the whole temperature range,which is still not negligible.With the increase of atomic number Z,the total DR rate coefficient increases and the peak value moves to high temperature gradually.The DR rate coefficients of the ground state and first excited state are fitted and the fitting parameters are obtained.The regularity of DR rate coefficients with atomic number is summarized.An empirical formula for the regularity of DR rate coefficients at high temperatures in ground state is obtained for easy to use.The results of this study will be used to synthesize the results of subsequent studies in the group,and it is expected to obtain an empirical formula for calculating the DR rate coefficients of various isoelectronic sequences of various elements.