Abstract
Rotational transitions were measured for five isotopomers of HCCHCO using a Flygare—Balle type microwave spectrometer. The observed spectrum is consistent with a linear, hydrogen-bonded HCCHCO structure. Measured rotational constants in MHz, are B = 1397.370(1) for HCCOCO, 1394.963(1) for HCCDCO, 1385.142(1) for HCCHCO, 1331.23(1) for DCCHCO and 1329.684(2) for DCCDCO. The measured rotational constants were fit to obtain a center-of-mass separation for HCCHCO of R* c.m. = 5.018(7) Å. Distortion constants were obtained and analyzed to obtain a force constant and estimate the dissociation energy.
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