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*
1 School of Optoelectronics, University of Chinese Academy of Sciences, Beijing 100049, China2 Data Center for High Energy Density Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
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.
收稿日期: 2021-07-28
出版日期: 2021-10-13
:
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)
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