The ratio between the Landé g-factors of the 87 Rb F = 2 and 85 Rb F = 3 ground-state hyperfine levels is experimentally measured to be g F (87)/g F (85) = 1.4988586(1), consistent with previous measurements. The g-factor ratio is determined by comparing the Larmor frequencies of overlapping ensembles of 87 Rb and 85 Rb atoms contained within an evacuated, antirelaxation-coated vapor cell. The atomic spins are polarized via synchronous optical pumping and the Larmor frequencies are measured by off-resonant probing using optical rotation of linearly polarized light. The accuracy of this measurement of g F (87)/g F (85) exceeds that of previous measurements by a factor of ≈50 and is sensitive to effects related to quantum electrodynamics.

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