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- W4311694003 abstract "In view of the difficulty in calculating the atomic structure parameters of high-$Z$ elements, the HFR (Hartree-Fock with relativistic corrections) theory in combination with the ridge regression (RR) algorithm rather than the Cowan code's least squares fitting (LSF) method is proposed and applied. By analyzing the energy level structure parameters of the HFR theory and using the fitting experimental energy level extrapolation method, some excited state energy levels of the {Yb~I} ($Z=70$) atom including the $4f$ open shell are calculated. The advantages of the ridge regression algorithm are demonstrated by comparing it with Cowan's least squares results. In addition, the results obtained by the new method are compared with the experimental results and other theoretical results to demonstrate the reliability and accuracy of our approach." @default.
- W4311694003 created "2022-12-28" @default.
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- W4311694003 date "2023-03-01" @default.
- W4311694003 modified "2023-09-25" @default.
- W4311694003 title "Ridge regression energy levels calculation of neutral ytterbium (Z = 70)" @default.
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- W4311694003 doi "https://doi.org/10.1088/1674-1056/acac08" @default.
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