Hyperfine Structure of the Rotational Spectrum of HDO

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Abstract
The hyperfine structure of the 32→33 and 52→53 rotational transitions of HDO, which fall at about 825 and 487 Mc, respectively, have been studied using microwave cavities as spectrometers. The experiments illustrated the usefulness of large Q cavities as spectrometers for this kind of work. The 32→33 transition was resolved into a symmetrical pattern consisting of a strong central line with six weak satellites on each side. The minimum full linewidth between half‐power points that was achieved was about 10 or 12 kc. The spectrum was fitted with CH=—46.6±0.3 kc, CD=—1.66±0.3 kc, and (eqQ)OD=310.3±3 kc. The 52→53 transition was resolved into a symmetrical pattern also, with a strong central line and three weak satellites on each side. The minimum full linewidth between half‐power points was about 6 kc. The spectrum was fitted with CH=—47.38±0.1 kc, CD=—2.42±0.1 kc, and (eqQ)OD=314.3±1.5 kc. A systematic comparison of the results with those obtained elsewhere on the 21→22 transition in HDO is made. The qualitative features of the spectra are consistent with what one would expect on the basis of existing theory, but the present state of the theory may be inadequate for explaining some of the quantitative details of the magnetic structure.

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