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

McGuyer, B. H.

doi:10.1063/5.0145919

Title: Isotope study of the nonlinear pressure shifts of ⁸⁵ Rb and ⁸⁷ Rb hyperfine resonances in Ar, Kr, and Xe buffer gases

Journal Article · Fri Apr 14 00:00:00 EDT 2023 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/5.0145919· OSTI ID:1969756

^[1]

Department of Physics, Princeton University, Princeton, New Jersey 08544, USA

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 vapor-cell atomic clocks and related devices.

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Sponsoring Organization:: USDOE

OSTI ID:: 1969756

Journal Information:: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Vol. 158 Journal Issue: 14; ISSN 0021-9606

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Isotope study of the nonlinear pressure shifts of ⁸⁵ Rb and ⁸⁷ Rb hyperfine resonances in Ar, Kr, and Xe buffer gases