Microwave Spectrum and Properties of Vinylene Carbonate

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Abstract
The microwave spectrum of vinylene carbonate has been investigated in the region from 19 000 to 32 000 Mc/sec. Eight R-branch transitions have been identified and fitted with the following spectroscopic parameters: a = 9346.79 Mc/sec, b = 4188.46 Mc/sec, c = 2891.54 Mc/sec, all ±0.10 Mc/sec; k = —0.59818. The dipole moment of the vapor, as determined from Stark effect studies, is 4.51±0.05D and lies in the a-axis. The molecule has been shown to be planar. The significance of these results is discussed.
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