Nuclear magnetic shielding in heliumlike ions
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866914769614667776 |
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| author | Yerokhin, Vladimir A. Pachucki, Krzysztof Harman, Zoltán Keitel, Christoph H. |
| author_facet | Yerokhin, Vladimir A. Pachucki, Krzysztof Harman, Zoltán Keitel, Christoph H. |
| contents | Ab initio QED calculations of the nuclear magnetic shielding constant in helium-like ions are presented. We combine the nonrelativistic QED approach based on an expansion in powers of the fine-structure constant $α$ and the so-called ``all-order'' QED approach which includes all orders in the parameter $Zα$ but uses a perturbation expansion in the parameter $1/Z$ (where $Z$ is the nuclear charge number). The combination of the two complementary methods makes our treatment applicable both to low-$Z$ and high-$Z$ ions. Our calculations confirm the presence of a rare antiscreening effect for the relativistic shielding correction and demonstrate the importance of the inclusion of the negative-energy part of the Dirac spectrum. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_06582 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Nuclear magnetic shielding in heliumlike ions Yerokhin, Vladimir A. Pachucki, Krzysztof Harman, Zoltán Keitel, Christoph H. Atomic Physics Chemical Physics Ab initio QED calculations of the nuclear magnetic shielding constant in helium-like ions are presented. We combine the nonrelativistic QED approach based on an expansion in powers of the fine-structure constant $α$ and the so-called ``all-order'' QED approach which includes all orders in the parameter $Zα$ but uses a perturbation expansion in the parameter $1/Z$ (where $Z$ is the nuclear charge number). The combination of the two complementary methods makes our treatment applicable both to low-$Z$ and high-$Z$ ions. Our calculations confirm the presence of a rare antiscreening effect for the relativistic shielding correction and demonstrate the importance of the inclusion of the negative-energy part of the Dirac spectrum. |
| title | Nuclear magnetic shielding in heliumlike ions |
| topic | Atomic Physics Chemical Physics |
| url | https://arxiv.org/abs/2403.06582 |