Hyperfine Structure of HD17O by Beam-Maser Spectroscopy

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Abstract
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) .