Abstract
THE number of Raman frequencies to be expected for the molecule SO3 is either three or four, according as it has the symmetry D3h (plane form) or C3 (pyramidal symmetry). The Raman spectrum of gaseous sulphur trioxide was determined with a Hilger E1 spectrograph, but only the frequency 1068.5 ± 0.5 was found with certainty1. A decision on the structure is thus not possible, as the infra-red absorption of sulphur trioxide is, so far as we know, unknown.
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The vapour contains only single molecules ; compare A. Smits and N. F. Moerman, NATURE, 134, 698 (1934).
Phil. Mag., (7), 15, 263 (1933).
Ind. J. Phys., 5, part 1, 49 (1930).
A. Smits, Versl. Kon. Akad. Amsterdam, 32, 349 (1923); NATURE, 113, 855 (1924).
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GERDING, H., NIJVELD, W. & MULLER, G. Raman Effect of Gaseous and Liquid Sulphur Trioxide and of Mixtures of the Trioxide with the Dioxide. Nature 137, 1033 (1936). https://doi.org/10.1038/1371033a0
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DOI: https://doi.org/10.1038/1371033a0
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