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The rotational spectrum of $^{15}$ND in its ground electronic$X^{3}\Sigma^{-}$ state has been observed for the first time. Forty-threehyperfine-structure components belonging to the ground and v = 1 vibrationalstates have been recorded with a frequency-modulationmillimeter-/submillimeter-wave spectrometer. These new measurements, togetherwith the ones available for the other isotopologues NH, ND, and $^{15}$NH, havebeen simultaneously analysed using the Dunham model to represent thero-vibrational, fine, and hyperfine energy contributions. The least-squares fitof more than 1500 transitions yielded an extensive set of isotopicallyindependent $U_{lm}$ parameters plus 13 Born--Oppenheimer Breakdowncoefficients $\Delta_{lm}$. As an alternative approach, we performed a Dunhamanalysis in terms of the most abundant isotopologue coefficients $Y_{lm}$ andsome isotopically dependent Born--Oppenheimer Breakdown constants $\delta_{lm}$[R. J. Le Roy, J. Mol. Spectrosc. 194, 189 (1999)]. The two fits provideresults of equivalent quality. The Born--Oppenheimer equilibrium bond distancefor the imidogen radical has been calculated [$r_e^{BO}$ =103.606721(13) pm]and zero point energies have been derived for all the isotopologues.

The rotational spectrum of $^{15}$ND. Isotopic-independent Dunham-type analysis of the imidogen radical