The experimental frequencies have been reported by
(1) O. Zakharenko, R. A. Motiyenko, L. Margulès, and T. R. Huet, 2015, J. Mol. Spectrosc. 317, 41.
Some higher order parameters were estimated from HDCO parameters essentially from that work. The reported uncertainties appear to be too conservative.
The predictions may be sufficiently accurate for all astronomical purposes. Predictions with uncertainties larger than 0.3 MHz should be viewed with caution.
Because of the lower symmetry of HDC¹⁸O with respect to the main isotopic species, spin-statistics do not have to be considered !
The dipole moment was assumed to agree with that of HDCO, see e031501.cat.