Ti^(21+)和Ti^(20+)离子双电子复合过程的理论研究

Theoretical study on dielectronic recombination of highly charged Ti^(21+) and Ti^(20+) ions

利用多组态Dirac-Fock(MCDF)方法和密度矩阵理论,系统计算了类氢Ti^(21+)(1s)和类氦Ti^(20+)(1s^2)离子KLL双电子复合过程中所有共振双激发态的能级、辐射和Auger跃迁的几率,以及双电子伴线的强度、角分布和极化度.研究了Breit相互作用对Auger几率、双电子伴线强度和辐射X射线极化度的影响.计算结果与已有文献和EBIT实验测量结果符合较好.

In this work , the KLL dielectronic recombination（DR） processes and linear polarization degree of emitted X‐rays are investigated for Ti21＋ （1s ） and Ti20＋ （1s2 ） ions in the framework of multi‐configuration Dirac‐Fock（MCDF） method and the density matrix theory . The resonance energis , radiative and Aauger transition probabilities , the resonance strengths , angular distributions and linear polarization degrees for all of KLL dielectronic satellite lines are presented . In the calculations , the electron correlation effects , QED effects and Breit interactions have been well considered . Comparison is made between the present results and the EBIT experimental measurements ,a good agreement is obtained .