Abstract
Time-resolved absorption spectroscopy was applied to the triplet species produced by anthracene-sensitized flash photolysis of the all-trans, 7-cis, 9-cis, 13-cis, and 15-cis isomers of β-carotene. Upon triplet excitation, the all-trans and 15-cis isomers produced an identical triplet species showing the same spectrum and decay constant, while the other isomers produced different triplet species of their own. Concerning the initial and final ground-state isomers, excitation from and subsequent relaxation to the original isomer were seen for the all-trans, 7-cis, and 9-cis isomers, while isomerization into the all-trans isomer was seen for the 13-cis and 15-cis isomers.
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