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Song CX, Yan ST, Godefroid M, Bieroń J, Jönsson P, Gaigalas G, Ekman J, Zhang XM, Chen CY, Ning CG, Si R. Isotope shifts in electron affinities and in binding energies of Pb and hyperfine structure of 207Pb. J Chem Phys 2024; 160:214307. [PMID: 38832742 DOI: 10.1063/5.0212299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Accepted: 05/20/2024] [Indexed: 06/05/2024] Open
Abstract
The isotope shifts in electron affinities of Pb were measured by Walter et al. [Phys. Rev. A 106, L010801 (2022)] to be -0.002(4) meV for 207-208Pb and -0.003(4) meV for 206-208Pb by scanning the threshold of the photodetachment channel Pb-(S3/2◦4) - Pb (3P0), while Chen and Ning reported 0.015(25) and -0.050(22) meV for the isotope shifts on the binding energies measured relative to 3P2 using the SEVI method [J. Chem. Phys. 145, 084303 (2016)]. Here we revisited these isotope shifts by using our second-generation SEVI spectrometer and obtained -0.001(15) meV for 207-208Pb and -0.001(14) meV for 206-208Pb, respectively. In order to aid the experiment by theory, we performed the first ab initio theoretical calculations of isotope shifts in electron affinities and binding energies of Pb, as well as the hyperfine structure of 207Pb-, by using the MCDHF and RCI methods. The isotope shifts in electron affinities of 207-208Pb and 206-208Pb are -0.0023(8) and -0.0037(13) meV for the 3P0 channel, respectively, in good agreement with Walter et al.'s measurements. The isotope shifts in binding energies relative to 3P1,2, -0.0015(8) and -0.0026(13) meV for 207-208Pb and 206-208Pb, respectively, are compatible with the present measurements. The hyperfine constant for the ground state of 207Pb- obtained by the present calculations, A(S3/2◦4)=-1118 MHz, differs by a factor of 3 from the previous estimation by Bresteau et al. [J. Phys. B: At., Mol. Opt. Phys. 52, 065001 (2019)]. The reliability is supported by the good agreement between the theoretical and experimental hyperfine parameters of 209Bi.
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Affiliation(s)
- C X Song
- Shanghai EBIT Lab, Key Laboratory of Nuclear Physics and Ion-Beam Application, Department of Nuclear Science and Technology, Institute of Modern Physics, Fudan University, Shanghai 200433, China
| | - S T Yan
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - M Godefroid
- Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing, Université Libre de Bruxelles, Brussels 1050, Belgium
| | - J Bieroń
- Instytut Fizyki Teoretycznej, Uniwersytet Jagielloński, Kraków, Poland
| | - P Jönsson
- Department of Materials Science and Applied Mathematics, Malmö University, SE-20506 Malmö, Sweden
| | - G Gaigalas
- Institute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio av. 3, LT-10222 Vilnius, Lithuania
| | - J Ekman
- Department of Materials Science and Applied Mathematics, Malmö University, SE-20506 Malmö, Sweden
| | - X M Zhang
- Shanghai EBIT Lab, Key Laboratory of Nuclear Physics and Ion-Beam Application, Department of Nuclear Science and Technology, Institute of Modern Physics, Fudan University, Shanghai 200433, China
| | - C Y Chen
- Shanghai EBIT Lab, Key Laboratory of Nuclear Physics and Ion-Beam Application, Department of Nuclear Science and Technology, Institute of Modern Physics, Fudan University, Shanghai 200433, China
| | - C G Ning
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - R Si
- Shanghai EBIT Lab, Key Laboratory of Nuclear Physics and Ion-Beam Application, Department of Nuclear Science and Technology, Institute of Modern Physics, Fudan University, Shanghai 200433, China
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