Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume 54, Issue 6, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6455/abcdf0
Keywords
relativistic coupled-cluster method; hyperfine-structure constant; La II
Categories
Funding
- National Natural Science Foundation of China [11504094]
- Post-doctoral research project of SZTU [202028555301011]
- project of Educational Commission of Guangdong Province of China [2020KTSCX124]
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The hyperfine-structure constants A and B of 24 low-lying states of La2+ are calculated using the singles and doubles approximated relativistic coupled-cluster method. The results show reasonable agreement with experimental values for certain states, but significant deviations for others. The role of electron correlation effects is further investigated using lower-order many-body perturbation theory and coupled-cluster methods.
Using the singles and doubles approximated relativistic coupled-cluster method, we calculate hyperfine-structure constant A and B of 24 low-lying states of La2+. The results of the lowest four states 5d(3/2,5/2) and 4f(5/2,7/2) are compared with recently measured values (Olmschenk et al 2017 Phys. Rev. A 96 032502). Reasonable agreement is found for hyperfine-structure constant A of 5d(3/2) and 4f(5/2,7/2) states, but the hyperfine-structure constant A of 5d(5/2) and the hyperfine-structure constant B have a large deviation. To understand the role of the electron correlation effect, the intermediate results from lower-order many-body perturbation-theory and the linear version of coupled-cluster with single and double approximation are also presented. In the framework of coupled-cluster theory, the contribution trends from individual correlation effects are also investigated.
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