Atoms through the looking glass – a relativistic challenge

Pendrill, Ann-Marie

doi:10.1139/p07-116

Cited by 3 publications

(3 citation statements)

References 116 publications

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“…The RIS of levels (denoted L) is easier to interpret, from the perspective of atomic theory, than that of lines [35,61,62]. Moreover, due to the fact that there are many more lines than levels, recalculating the line IS from level IS results in a substantial increase in precision.…”

Section: Residual Level Shiftsmentioning

confidence: 99%

Isotope shifts inNe20,22: Precision measurements and global analysis in the framework of intermediate coupling

et al. 2019

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We report new precision measurements of the 20 Ne-22 Ne isotope shift for several transitions, as well as state-of-the-art, ab initio field-shift calculations. Our results are combined with historical measurements in a global fit to obtain the isotope shifts of all fifty low-lying neon levels with high precision. These level shifts show a wealth of electronic, nuclear, and relativistic phenomena. Relying on the analogy between mass shift and fine-structure operators, we explain this plethora of neon level-shifts utilizing a small number of effective parameters in a global parametric investigation. This investigation provides a birds-eye view on the isotope shift phenomena in noble gasses. From this vantage point, we reinterpret every effort made to calculate neon mass-shifts ab initio, and show that a remarkable agreement between experiment and theory is obtained.

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Section: Residual Level Shiftsmentioning

confidence: 99%

Isotope shifts inNe20,22: Precision measurements and global analysis in the framework of intermediate coupling

et al. 2019

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“…This sensitivity expresses itself as a noticeable perturbation of the standard hyperfine splitting. A complete description of the electron-nuclear interaction and of the nuclear distributions is not only a prerequisite for QED measurements, as our discussion has already shown, but also for the interpretation of atomic parity non-conservation experiments induced by the weak interaction, as detailed in the review by Mårtensson-Pendrill [61].…”

Section: Hyperfine Structure In High-z Ionsmentioning

confidence: 77%

Testing QED and atomic-nuclear interactions with high-Zions

Beiersdörfer

2010

J. Phys. B: At. Mol. Opt. Phys.

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Measurements of high-Z hydrogen-like ions have not yet been able to compete with the ultra-high precise test of quantum electrodynamics (QED) carried out using atomic hydrogen. However, recent advances in theory and experiment have enabled measurements involving high-Z lithium-like ions to test two-loop QED at a level similar to that achieved with atomic hydrogen. Tests of two-loop QED are limited in both cases by the uncertainties in the finite nuclear size, i.e. the uncertainties associated with the proton charge radius and the finite size of high-Z nuclei, respectively. Future experiments employing high-Z ions are described that might go beyond the present limitations. Measurements of the hyperfine splitting in highly charged ions cannot readily be described by theory, in part because of poor understanding of the finite nuclear magnetization radius. The discrepancy between measurements and theory leaves open the possibility of new physics not yet addressed by our current understanding of atomic-nuclear interactions.

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“…GRASP2018 allows for a two parameter Fermi distribution to be used to approximate the nuclear charge distribution. Figure 1 shows the normalized Fermi distribution ρ(r)/ρ F for the nuclear model with the rms radius 5.4474 fm from [11] and a skin thickness t = 2.3 fm [17]. The shape of the nuclear distribution can be described by the moments r 2n of the distribution.…”

Section: Fermi Distributionmentioning

confidence: 99%

Calculation of the Differential Breit–Rosenthal Effect in the 6s6p 3P1,2 States of Hg

Heggset

Persson

2020

Atoms

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Studies of the hyperfine anomaly has found a renewed interest with the recent development of techniques to study the properties of long chains of unstable nuclei. By using the hyperfine structure for determining the nuclear magnetic dipole moments, the hyperfine anomaly puts a limit to the accuracy. In this paper, the differential Breit–Rosenthal effect is calculated for the 6s6p3P1,2 states in 199Hg as a function of the change in nuclear radii, using the MCDHF code, GRASP2018. The differential Breit–Rosenthal effect was found to be of the order of 0.1%fm−2, in most cases much less than the Bohr-Weisskopf effect. The results also indicate that large calculations might not be necessary, with the present accuracy of the experimental values for the hyperfine anomaly.

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Atoms through the looking glass – a relativistic challenge

Cited by 3 publications

References 116 publications

Isotope shifts inNe20,22: Precision measurements and global analysis in the framework of intermediate coupling

Isotope shifts inNe20,22: Precision measurements and global analysis in the framework of intermediate coupling

Testing QED and atomic-nuclear interactions with high-Zions

Calculation of the Differential Breit–Rosenthal Effect in the 6s6p 3P1,2 States of Hg

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