frans-octatetraene and have reassigned it using ab initio SCF frequencies scaled by our technique. Although they do not correct for electron correlation as we do here, their scaled results are in good agreement with ours. Their proposed final assignment of the light molecule is essentially identical with ours. It is particularly pleasing that our prediction of a medium infrared band near 1580 cm'1 has been borne out by the new experiment. Several other weak bands that were predicted by theory have also been found. Another, very recent paper on this subject has been published by Zerbetto et al. [J. Chem. Phys. 1988, 89, 3681].Acknowledgment. Acknowledgment is made to the donors of the Petroleum Research Fund, administered by the American Chemistry Society, for support of this research. The calculations were performed with a Celerity 1200 minicomputer, purchased with support of the National Science Foundation, under Grant No. CH-8500487.

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