Abstract
Forty lines of the microwave spectra of D217O and D218O have been measured in the region from 8 to 400 GHz and analyzed according to Watson's centrifugal distortion theory. Comparison of the results obtained for D216O, D217O, and D218O demonstrates their internal consistency. The transferability of the parameters according to the isotopic substitution rules is evidence for the validity of the model chosen for the study of the ground state of heavy water.The effective rotational constants deduced from the observed spectra are very close to the values calculated using Oka's second order theory. The values obtained in MHz are: The hyperfine structure of the D217O lines has been analyzed using as a reference the corresponding quadrupole coupling tensor of HD17O with the appropriate rotation. The values of χgg in MHz used for the analysis are:
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