HYPERFINE STRUCTURE OF HD17O BY BEAM-MASER SPECTROSCOPY

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 CJt(K) and for the components χij (K) of the quadrupole coupling tensors in their principal coordinate systems are in kHz: C22=-42.20±0.20; C2 = -42.987plusmn;0.20; C2, = -2.04±0.02; C2-2.0000±0.0015; C22=-22.5±0. 3; C2=-22.35±0.20; =10 17S±67; = -8891±21; (O)=-1283±87; X(D) = 307.90±0.14;(D) = -133.13±0.14; ±(D) = -174.78±0.29; ,= (-X)/X 0.75±0.01. These results show good agreement with recent ab initia calculations and remove the discrepancy with the experimental results of Stevenson and Townes = 1.83±0.20).