类铷等电子序列双电子复合过程的理论研究  

Theoretical investigation of dielectronic recombination process for Rb-like isolelectronic sequence

作　　者：符彦飙[1] 杨志龙 FU Yan-biao;YANG Zhi-long(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,Gansu,China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃兰州730070

出　　处：《西北师范大学学报（自然科学版）》2020年第5期42-48,共7页Journal of Northwest Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(11464043)。

摘　　要：基于全相对论组态相互作用理论的FAC程序包,详细计算了类铷等电子序列离子双激发态(4s^24p^64d^1)-1 nln'l'(n=4,5,6,n'≤23,l'≤12)7个离子(Sb^14+,Te^15+,Xe^17+,Tb^28+,Hf^35+,W^37+,Au^42+)的双电子复合(Dielectronic reombination,DR)速率系数,并用能级到能级的方法外推到n'=1000.分别研究了激发通道和辐射通道、共振稳态跃迁(RS)和非共振稳态跃迁以及辐射跃迁到可自电离态及随后的级联退激(DAC)对DR速率系数的贡献,分析了各种效应随着原子序数(Z)的变化规律.研究表明,RS+NRS随着Z的增大对速率系数的影响越来越大,而DAC的贡献随着Z的增大越来越小,对于Au^42+离子(Z=79),其贡献在50000 eV处最大,达到14.36%,仍不可忽略.最后,总结了这7个离子总的DR速率系数的规律.为了便于使用,对7个离子总的DR速率系数进行了参数拟合,得到了适用于类铷等电子序列的适用于中高温区域的一个经验拟合公式.The dielectronic recombination(DR)rate coefficients of Rb-like 7 ions(Sb^14+,Te^15+,Xe^17+,Tb^28+,Hf^35+,W^37+,Au^42+)in double excited states(4s^24p^64d^1)-1 nln'l'(n=4,5,6,n'≤23,l'≤12)are calculated in detail by using FAC package based on the fully relativistic configuration interaction theory.And extrapolated to n'=1000 by the method of energy level to energy level.Influence of excitation and radiation channels,resonant radiative stabilizing transitions(RS),non-resonant and resonant radiative stabilizing transitions(NRS)and the contributions from decays into autoionizing levels possibly followed by radiative cascades(DAC)on DR are investigated and the regularity of various effects is revealed.And the regularity of various effects with atomic number(Z)is revealed.Results show that the effect of RS+NRS on the rate coefficient is increase with the increasing atomic number(Z),the contribution of DAC becomes smaller.Among them,Au^42+(Z=79)ions contributed the least,with 14.36%contribution at 50000 eV,which can not be ignored.In order to facilitate use of the obtained total DR rate coefficient for parameter fitting.The law of the total rate coefficient is summarized,and an empirical formula suitable for medium and high temperature in Rb-like isoelectronic sequences is obtained.

关 键 词：双电子复合 速率系数 DAC效应 

分 类 号：O562.5[理学—原子与分子物理]