The gas-phase cis-trans isomerization of 1,3-pentadiene, photosensitized by a thin polymeric film, has been studied at I 3 300 rnp and 50°C in the pressure range 5 to 200 torr. The observed photostationary state and the influence of substrate pressure on the rate of isomerization suggest a reaction mechanism similar to that proposed for triplet photosensitized isomerizations in solutions [2].
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