Enhanced Coupling of Electron and Nuclear Spins by Quantum Tunneling Resonances

Tsinovoy, Anatoli; Katz, Or; Landau, Arie; Moiseyev, Nimrod

doi:10.1103/physrevlett.128.013401

Cited by 6 publications

(1 citation statement)

References 78 publications

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“…[7][8][9] The potential δ A(R) is generally expected to change sign at least once at small R for our molecules of interest. 8,9,35,37,[51][52][53][54][55][56][57][58] As a result, the sign of the fitting parameters for binary and molecular shifts need not agree. 34 The molecular energies follow Eqs.…”

Section: Hyperfine-shift Interactionmentioning

confidence: 99%

Isotope study of the nonlinear pressure shifts of $^{85}$Rb and $^{87}$Rb hyperfine resonances in Ar, Kr, and Xe buffer gases

McGuyer

2023

Preprint

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Measurements of the 0-0 hyperfine resonant frequencies of ground-state 85 Rb atoms show a nonlinear dependence on the pressure of the buffer gases Ar, Kr, and Xe. The nonlinearities are similar to those previously observed with 87 Rb and 133 Cs and presumed to come from alkali-metal-noble-gas van der Waals molecules. However, the shape of the nonlinearity observed for Xe conflicts with previous theory, and the nonlinearities for Ar and Kr disagree with the expected isotopic scaling of previous 87 Rb results. Improving the modeling alleviates most of these discrepancies by treating rotation quantum mechanically and considering additional spin interactions in the molecules. Including the dipolar-hyperfine interaction allows simultaneous fitting of the linear and nonlinear shifts of both 85 Rb and 87 Rb in either Ar, Kr, or Xe buffer gases with a minimal set of shared, isotope-independent parameters. To the limit of experimental accuracy, the shifts in He and N 2 were linear with pressure. The results are of practical interest to vaporcell atomic clocks and related devices. CONTENTS Data Availability Statement 17 S-I. Averaging over the direction of rotation 18 S-II. Estimates for the dipolar-and quadrupolar-hyperfine interactions 18 S-III. Pressure-gauge linearization corrections 18 S-IV. Positional shift in Camparo 18 S-V. Predictions for variation with transition and applied field 19 S-VI. Fit parameters for plotted curves 19

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Section: Hyperfine-shift Interactionmentioning

confidence: 99%

Isotope study of the nonlinear pressure shifts of $^{85}$Rb and $^{87}$Rb hyperfine resonances in Ar, Kr, and Xe buffer gases

McGuyer

2023

Preprint

View full text Add to dashboard Cite

show abstract

Collisional shifts of hyperfine resonances of ground-state atoms calculated with modified pseudopotential and orthogonalization

Ishikawa

2024

Appl. Phys. B

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Noble-gas atoms characterized by hyperfine frequency shift of lithium atom

Ishikawa

2022

The Journal of Chemical Physics

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We report an experimental and theoretical study on the shift of the hyperfine splitting frequency of ground-state Li atoms in noble gases, He, Ne, Ar, and Xe. The frequency shift is due to the change in the electron-spin density at the Li nuclei induced by collisions to the noble-gas atoms. The electron density is calculated along the interatomic distance in a pseudopotential and a dispersion potential. Based on the measured and the calculated frequency shifts, we find the importance of attractive force in collisions to helium as well as heavy noble-gas atoms. Taking advantage of the simple energy structure of the Li atom, we obtain the s wave scattering length for free electrons on noble-gas atoms by using the hyperfine splitting frequency as a precise measure.

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Enhanced Coupling of Electron and Nuclear Spins by Quantum Tunneling Resonances

Cited by 6 publications

References 78 publications

Isotope study of the nonlinear pressure shifts of $^{85}$Rb and $^{87}$Rb hyperfine resonances in Ar, Kr, and Xe buffer gases

Isotope study of the nonlinear pressure shifts of $^{85}$Rb and $^{87}$Rb hyperfine resonances in Ar, Kr, and Xe buffer gases

Collisional shifts of hyperfine resonances of ground-state atoms calculated with modified pseudopotential and orthogonalization

Noble-gas atoms characterized by hyperfine frequency shift of lithium atom

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