类氖和类钠钨离子LMM双电子复合过程的研究

基于相对论组态相互作用理论方法,系统研究了类氖和类钠钨离子的LMM双电子复合过程(DR).考虑了电子关联效应、Breit相互作用、QED等效应,计算给出了LMM-DR过程相关的W63+,W62+离子单、双激发态的能级和相关的辐射、Auger几率,以及DR过程的强度和截面.基于理论计算,对Tokyo-EBIT实验测得的1.0~5.0keV能区的X射线谱进行了模拟和分析,理论计算很好地模拟并标识出了实验谱中来自W64+和W63+离子的共振峰.     

Relativistic R-matrix calculations for L-shell photoionization cross sections of C Ⅱ

The photoionization cross section of the ground state 2s~22 p ~2P_(1/2)~o and the first excited state 2 s~22 p ~2P_(3/2)~o of CⅡ ions are systematically calculated using the fully relativistic R-matrix code DARC. The detailed resonances are presented and identified for the photon energy ranging from threshold(24.38 eV) up to 41.5 eV where the L-shell(2 p, 2 s) photoionization process is dominant. In the calculations, the relativistic effect and electronic correlation effect are well considered. It is found that the relativistic effect is very important for the light atomic system CⅡ, which accounts for experimentally observed fine structure resonance peaks. A careful comparison is made between the present results and the experimental values, and also other theoretical data available in the literature, showing that good agreement is obtained for the resonance peaks.