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The pure rotational Raman spectrum of sulphur trioxide in the vapour phase at 333K has been obtained and analysed for the first time. The following rotational constants and bond length were determined: This r0 value agrees to within the sum of one standard deviation of the experimental errors with the value obtained from an analysis of the vibration–rotational infrared spectrum of the 2ν3 band.
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Brassington et al. (1978) studied this question.
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