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The hyperfine and Zeeman components of the 3–2–22 and 43–51 transitions of D2O, the 22−21 transition of HDO, and the 6−5−5−1 transition of H2O have been measured with a beam-maser Zeeman spectrometer. This allowed determination of the elements of the magnetic moment tensor Ggg and of the anisotropic part of the magnetic susceptibility tensor (χgg–χAv) for D2O. The best fit results are (for χgg–χAv in 10−8kHZ G−2): Gaa = 0.32530(10), Gbb = 0.36009(22), Gcc = 0.32513(15), χaa–χAv = 3.88(20), χbb–χAv = − 1.66(40), χcc–χAv = − 2.23(30). From these values the elements of the molecular quadrupole moment tensor for D2O have been determined (in 10−26 esu·cm): θaa = 2.72(2), θbb = − 0.32(3), θcc = −2.40(2). The sign of the molecular electric dipole moment and the validity of the isotopic invariance of the electronic charge distribution have been investigated by comparing the molecular magnetic moments of D2O, HDO, and H2O. The obtained experimental values for several one-electron properties are in fair agreement with recent accurate ab initio calculations.

Hyperfine structure of the 22→21 rotational transition of HD17O at 10.374 GHz has been investigated with a beam-maser spectrometer. The best-fit results for the spin–rotation coupling constants CJτ(K) and for the components χij(K) of the quadrupole coupling tensors in their principal coordinate systems are in kHz: C22(H) = − 42.20 ± 0.20; C21(H) = − 42.98 ± 0.20; C22(D) = − 2.04 ± 0.02; C21(D) = − 2.0000 ± 0.0015; C22(O) = − 22.5 ± 0.3; C21(O) = − 22.35 ± 0.20; χxx(O) = 10 175 ± 67; χyy(O) = − 8 891 ± 21; χzz(O) = − 1283 ± 87; χx′x′(D) = 307.90 ± 0.14; χz′z′(D) = − 133.13 ± 0.14; χy′y′(D) = − 174.78 ± 0.29; η(O) = (χzz(O) − χyy(O)) / χxx(O) = 0.75 ± 0.01. These results show good agreement with recent ab initio calculations and remove the discrepancy with the experimental results of Stevenson and Townes (η(O) = 1.83 ± 0.20).

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