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The microwave spectra of HOCHzCN and DOCHzCN show that the molecule exists as the gauche rotamer in the gas phase. A large number of intense lines converging to a band head near 16 800 MHz for DOCHzCN and 110 700 MHz for HOCHzCN are attributed to the ZI = l+O transitions of the hydroxyl torsion. The rotational constants indicate that cce, the angle between the HOC and OCC planes at the potential minima is approximately 123" from the trans position. Potential functions which reproduce the observed ZI = 140 torsional frequencies have been obtained for 106"

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