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We report an improved measurement of the Land\'e g factor of the 5D5/2 stateof singly ionized barium. Measurements were performed on single Doppler-cooled138Ba+ ions in linear Paul traps using two similar, independent apparatuses.Transitions between Zeeman sublevels of the 6S1/2 and 5D5/2 states were drivenwith two independent, stabilized radio-frequency synthesizers using a dedicatedelectrode within each ion trap chamber. State detection within each Zeemanmanifold was achieved with a frequency-stabilized fiber laser operating at 1.76microns. By calculating the ratio of the two Zeeman splittings, and using themeasured Land\'e g factor of the 6S1/2 state, we find a value of1.200371(4stat)(6sys) for g of 5D5/2.

Radio frequency spectroscopy measurement of the Land\'e g factor of the 5D5/2 state of Ba+ with a single trapped ion