The assignment of ν2 and ν4 of SO3
Kaldor, A., Maki, A. G., Dorney, A. J. and Mills, I. (1973) The assignment of ν2 and ν4 of SO3. Journal of Molecular Spectroscopy, 45 (2). pp. 247-252. ISSN 0022-2852
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To link to this article DOI: 10.1016/0022-2852(73)90155-0
Three experiments have been performed to resolve an uncertainty in the assignment of ν2 and ν4 for SO3: (i) the gas phase Raman spectrum has been measured; (ii) the infrared active combination band ν3 + ν4 has been measured; (iii) a band contour calculation has been performed taking account of the ℓ-type resonance in ν4 and a strong Coriolis resonance between ν2 and ν4. These experiments establish beyond any doubt that ν2 lies at about 497.5 cm−1 and ν4 lies at about 530.2 cm−1. The contour calculation also shows that the Coriolis resonance gives rise to a positive intensity perturbation.