Chin. Phys. Lett.  2021, Vol. 38 Issue (11): 113101    DOI: 10.1088/0256-307X/38/11/113101
Effect of Electron Correlation and Breit Interaction on Energies, Oscillator Strengths, and Transition Rates for Low-Lying States of Helium
Qing Liu1, Jiguang Li2, Jianguo Wang2, and Yizhi Qu1*
1School of Optoelectronics, University of Chinese Academy of Sciences, Beijing 100049, China
2Data Center for High Energy Density Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
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Qing Liu, Jiguang Li, Jianguo Wang et al  2021 Chin. Phys. Lett. 38 113101
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Abstract The transition energies, E1 transitional oscillator strengths of the spin-allowed as well as the spin-forbidden and the corresponding transition rates, and complete M1, E2, M2 forbidden transition rates for 1$s^{2}$, 1$s$2$s$, and 1$s2p$ states of He I, are investigated using the multi-configuration Dirac–Hartree–Fock method. In the subsequent relativistic configuration interaction computations, the Breit interaction and the QED effect are considered as perturbation, separately. Our transition energies, oscillator strengths, and transition rates are in good agreement with the experimental and other theoretical results. As a result, the QED effect is not important for helium atoms, however, the effect of the Breit interaction plays a significant role in the transition energies, the oscillator strengths and transition rates.
Received: 28 July 2021      Published: 13 October 2021
PACS:  31.15.V- (Electron correlation calculations for atoms, ions and molecules)  
  31.30.J- (Relativistic and quantum electrodynamic (QED) effects in atoms, molecules, and ions)  
  31.30.jc (Relativistic corrections to atomic structure and properties)  
  31.15.A- (Ab initio calculations)  
Fund: Supported by the National Key Research and Development Program of China (Grant No. 2017YFA0402300), and the National Natural Science Foundation of China (Grant Nos. 11774344 and 11474033).
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Qing Liu
Jiguang Li
Jianguo Wang
and Yizhi Qu
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