The inversion splitting of 15NH2D and 15ND2H as obtained from their microwave and FIR spectra

The ground vibrational state of the partially deuterated species of ammonia 15NH2D and 15ND2H was investigated both experimentally and theoretically. Microwave and FIR spectra were recorded using samples of 15NH3 and 15ND3 in different mixing ratios. Line frequencies and line positions were analyzed for both species using an internal axis method approach. Rotational constants of the symmetric and antisymmetric inversion states, inversion splittings, and rotation-inversion coupling constants were retrieved. Linelists to be used for astronomical high-resolution observations were generated.