Theoretical Study of Interesting Fine-Structure Splittings Based on a Scenario for Precise Calculations  

作　　者：张小乐 程诚 高翔 李家明 

机构地区：[1]Department of Physics, Shanghai Key Laboratory for Laser Fabrication and Material Science, Shanghai Jiaotong University, Shanghai 200240 [2]The Key Laboratory of Atomic and Molecular Nanosciences (Ministry of Education), Department of Physics, Tsinghua University, Beijing 100084

出　　处：《Chinese Physics Letters》2010年第3期112-115,共4页中国物理快报（英文版）

基　　金：Supported by the Key Project of the Ministry of Education of China under Grant No 306020, the National Natural Science Foundation of China under Grant No 10734040, the National High-Tech ICF Committee in China, the Yin-He Super-computer Center, Institute of Applied Physics and Mathematics, Beijing, China, and the National Basic Research Program of China under Grant No 2006CB921408.

摘　　要：Based on the multi-configuration Dirac-Fock self-consistent field method, a scenario has been presented to calculate the fine-structure energy levels of C^2＋ and Si^2＋ excited states （31 D2 and 33D1,2,3）. The Breit interactions and quantum electrodynamics corrections are added as perturbations. The present calculation results are found to be in excellent agreement with the experimental data. By means of the precise calculation procedure, we elucidate that four competitive mechanisms influence the interesting fine-structure splittings in C^2＋ and Si^2＋, such as spin-orbit interactions, relativistic corrections of exchange interactions, the Breit interactions and electron correlation effects. Furthermore, the mechanism of relativistic correction of exchange interactions has been studied clearly. We elucidate that the inner shell 2p1/2,3/2 orbitals are essential to relativistic corrections of exchange interactions which are crucial for the final anomalous fine-structure splittings.Based on the multi-configuration Dirac-Fock self-consistent field method, a scenario has been presented to calculate the fine-structure energy levels of C^2＋ and Si^2＋ excited states （31 D2 and 33D1,2,3）. The Breit interactions and quantum electrodynamics corrections are added as perturbations. The present calculation results are found to be in excellent agreement with the experimental data. By means of the precise calculation procedure, we elucidate that four competitive mechanisms influence the interesting fine-structure splittings in C^2＋ and Si^2＋, such as spin-orbit interactions, relativistic corrections of exchange interactions, the Breit interactions and electron correlation effects. Furthermore, the mechanism of relativistic correction of exchange interactions has been studied clearly. We elucidate that the inner shell 2p1/2,3/2 orbitals are essential to relativistic corrections of exchange interactions which are crucial for the final anomalous fine-structure splittings.

分 类 号：O562.3[理学—原子与分子物理] TP334.2[理学—物理]