CCCO: Generation by dc glow discharge in carbon suboxide, and microwave spectrum

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Abstract

Generation of the CCCO molecule was observed through its microwave spectrum in a dc glow discharge of carbon suboxide. Thirteen rotational transitions J = 7-6 to 19-18 were measured in the frequency region 67–183 GHz with the use of a source-modulation microwave spectrometer. A least-squares analysis of 19 observed spectral lines, including the six previously reported by Brown et al., yielded the following revised molecular constants for CCCO: Bo = 4810.88624(65) MHz and Do = 0.00077707(130) MHz, with 3σ in parentheses. The concentrations of CCO as well as CCCO produced in the glow discharge are estimated to be about 11 ppm.

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