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

McGuyer, B. H.

doi:10.1063/5.0145919

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

Journal Article · Wed Apr 12 20:00:00 EDT 2023 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/5.0145919· OSTI ID:2424503

^[1]

Princeton Univ., NJ (United States)

Measurements of the 0–0 hyperfine resonant frequencies of ground-state ⁸⁵Rb 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 ⁸⁷Rb and ¹³³Cs 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 ⁸⁷Rb 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 ⁸⁵Rb and ⁸⁷Rb 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 N₂ were linear with pressure. Further, the results are of practical interest to vapor-cell atomic clocks and related devices.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE; US Air Force Office of Scientific Research (AFOSR); USDOD

OSTI ID:: 2424503

Alternate ID(s):: OSTI ID: 1969756

Journal Information:: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 14 Vol. 158; ISSN 1089-7690; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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