Breit相互作用和QED效应对铬离子K_αX射线的影响

Influence from Breit interaction and QEDs correctionson the K_αX of chromium

Breit相互作用和量子电动力学QED效应是在高精度研究铬的高离化态类He(CrⅩⅩⅤ)到类Ne(CrⅩⅤ)的KαX射线的过程中需要考虑的两种物理效应.本文利用全相对论组态相互作用(RCI)方法和多组态Dirac-Fock(MCDF)方法,采用Grasp92程序包的修正和并行版本GraspVU,通过使用扩大活动空间方法,计算了类He、类Li和类B铬离子KαX射线,计算值与实验值符合得很好.通过计算发现Breit修正和自能修正的贡献比较大,而真空极化相对来说较小,真空极化修正随着铬离子电子数的增加,基本接近一个常数.

Breit interaction and quantum electrodynamics（QEDs）corrections are two physical effects needed in high-precision calculation of the KαX-ray satellites from CrⅩⅤ through CrⅩ.In this paper,the relativistic configuration interaction（RCI）and multi-configuration Dirac-Fack（MCDF）method are used in the active interaction approach.Through the use of the active space method,the calculated values of KαX-ray are found to be in very good agreement with the other available data on He-like,Li-like and B-like chromium.The GraspVU package is used in this work which is a modified and parallel version of the Grasp92 code.With increasing number of electrons,Breit interaction and self-energy have a more profound effect on the final average energy,and the vacuum polarization is nearly smaller constant.