类锂离子双电子复合过程中辐射光子角分布和极化特性的理论研究  

Theoretical study on angular distribution and polarization characteristics of X-ray emission following dielectronic recombination of lithium-like ions

作　　者：王金霞[1] 师应龙[1] 张登红[1] 颉录有[1] 董晨钟[1,2] 

机构地区：[1]甘肃省原子分子物理与功能材料重点实验室,西北师范大学物理与电子工程学院,兰州730070 [2]西北师范大学与中科院近代物理研究所极端环境原子分子物理实验室,兰州730070

出　　处：《物理学报》2013年第23期139-145,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11274254;91126007;11147018);甘肃省自然科学基金(批准号:1010RJZA014);西北师范大学科技创新工程科研骨干培育项目资助的课题~~

摘　　要：基于多组态Dirac-Fock方法和密度矩阵理论,本文详细计算了高电荷态类锂离子(26 Z 92)KLL双电子复合过程中,自由电子被共振俘获到中间双激发态1s2s22p3/2J=1的磁子能级截面以及该双激发态的取向参数,进而得到了此激发态向基态电偶极辐射跃迁1s2s22p3/2J=1→1s22s2J=0所发出光子的角分布和极化度,重点讨论了Breit相互作用对相关物理量的影响.研究表明,Breit相互作用极大地改变了中间双激发态1s2s22p3/2J=1不同磁子能级的截面,从而导致了随后退激发放出光子的角分布和极化特性的显著变化.Based on the multiconfiguration Dirac-Fock method and the theory of density matrix, we have calculated the magnetic sublevel captured cross section of intermediate doubly-excited state 1s2s22p3/2J = 1 formed by dielectronic recombination of lithium-like ions （26 ≤ Z ≤ 92）. Then, we obtain the angular distribution and linear polarization of X-rays of electric-dipole radiation 1s2s22p3/2J = 1→1s22s2J = 0. In this study, emphasis is placed on the effects of the Breit interaction on the relevant physical quantities. We find that the influences of the Breit interaction on the alignment for the capture to the doubly-excited state 1s2s22p3/2J = 1 are dramatic, resulting in the remarkable change in the angular distribution and polarization properties of the X-ray emission.

关 键 词：角分布和极化特性 多组态DIRAC-FOCK方法 密度矩阵理论 

分 类 号：O562.4[理学—原子与分子物理]