The infra-red spectra of gaseous and liquid acrylonitrile have been studied from 2.5 μ to 25 μ with a spectrometer using LiF, CaF2, NaCl, and KBr prisms. The Raman spectrum of the liquid has been obtained, including intensity and polarization data. A normal coordinate calculation of the non-planar frequencies has been made, using force constants from related molecules. This information permits a complete assignment of the fifteen fundamental frequencies and a calculation of the thermodynamic quantities for the molecule.
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