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The rotational structures of some vibrational absorption bands of vinyl chloride, vinyl fluoride, vinylidene fluoride and glyoxal have been measured with high dispersion. An analysis of bands of different types has been carried out in order to test vibrational assignments and to correlate the observed rotational structure with the molecular geometry. An ambiguity in the allocation of vibration frequencies of vinyl fluoride has been removed, and the frequencies for the different vinyl halides have been correlated with each other. Glyoxal has been shown to possess the trans structure, in agreement with conclusions based on other physical measurements.
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Cole et al. (1949) studied this question.
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