Measurement of the ${}^{138}{\mathrm{Ba}}^{+}$ ${{}^{2}S}_{1/2}-{{}^{2}D}_{5/2}$ clock transition frequency and $D_{5/2}$ Landé $g_J$ factor are reported. The clock transition frequency ${\nu }_{{\mathrm{Ba}}^{+}}=170126432449333.31\pm (0.39{)}_{\mathrm{stat}}\pm (0.29{)}_{\mathrm{sys}}\mathrm{Hz}$, is obtained with accuracy limited by the frequency calibration of the maser used as a reference oscillator. The Landé $g_J$ factor for the ${{}^{2}D}_{5/2}$ level is determined to be $g_D=1.20036739(24)$, which is a 30-fold improvement on previous measurements. The $g$-factor measurements are corrected for an ac-magnetic field from trap-drive-induced currents in the electrodes, and data taken over a range of magnetic fields underscores the importance of accounting for this systematic.

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• Atomic, optical & lattice clocks