Abstract
A frequency measurement of the fine-structure transition $^{3}P_{1}\ensuremath{-}^{3}P_{0}$, $\ensuremath{\Delta}{m}_{j}=0$ in the first metastable triplet of $^{24}\mathrm{Mg}$ is reported. The experiment has been performed on a metastable atomic beam interacting with the submillimetric radiation ($\ensuremath{\lambda}\ensuremath{\simeq}0.5$ mm) of a phase-locked backward wave oscillator. The transition is observed via the fluorescence emission at 4571 \AA{} of the intercombination line $^{3}P_{1}\ensuremath{-}^{1}S_{0}$. The center frequency was evaluated to be $\ensuremath{\nu}=601277.16\ensuremath{\mp}0.05$ MHz with precision limited by first-order Doppler effect.
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