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When cis-stilbene was trapped in inert gas matrixes (N 2 , Ar, Kr) and then photoirradiated, evidence was obtained for the presence of the non-planar trans isomer of stilbene, in the matrix, which was identified using infrared spectroscopy. On annealing the matrix after photoirradiation, the intensity of the non-planar trans features decreased in intensity, while those of the planar trans...
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