Assignment of the <i>B</i><sub>1</sub> (antisymmetric) ring deformation in ethylene oxide has been the subject of controversy. This <i>B</i><sub>1</sub> vibration should produce a type-A IR band, and Lord and Nolin report a Q-branch peak at 892 cm<sup>-1</sup> which they assign as the <i>B</i><sub>1</sub> ring deformation. Thompson and Cave have suggested that the absorption maximum near 840 cm<sup>-1</sup> results from this <i>B</i><sub>1</sub> fundamental. Lord and Nolin obtained a vapor-phase IR spectrum of ethylene oxide-d<sub>4</sub>, and they assigned the 809 cm<sup>-1</sup> type-A band to the <i>B</i><sub>1</sub> ring deformation. By application of the product rule for the <i>B</i><sub>1</sub> class in ethylene oxide and ethylene oxide-d<sub>4</sub>, Lord and Nolin have demonstrated that it is reasonably certain that the <i>B</i><sub>1</sub> antisymmetric ring deformation must occur near 890 cm<sup>-1</sup>.

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