| ATOMIC AND MOLECULAR PHYSICS |
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Theoretical Study of Interesting Fine-Structure Splittings Based on a Scenario for Precise Calculations |
| ZHANG Xiao-Le1, CHENG Cheng1, GAO Xiang1, LI Jia-Ming1,2 |
| 1Department of Physics, Shanghai Key Laboratory for Laser Fabrication and Material Science, Shanghai Jiaotong University, Shanghai 200240 2The Key Laboratory of Atomic and Molecular Nanosciences (Ministry of Education), Department of Physics, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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ZHANG Xiao-Le, CHENG Cheng, GAO Xiang et al 2010 Chin. Phys. Lett. 27 033101 |
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Abstract Based on the multi-configuration Dirac-Fock self-consistent field method, a scenario has been presented to calculate the fine-structure energy levels of C2+ and Si2+ 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 C2+ and Si2+, 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.
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| Keywords:
31.15.Am
31.15.Rj
31.20.Jc
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Received: 21 September 2009
Published: 09 March 2010
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