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Time-resolved absorption spectroscopy of the triplet state produced from the all-trans, 7-cis, 9-cis, 13-cis, and 15-cis isomers of β-carotene

✍ Scribed by Hideki Hashimoto; Yasushi Koyama; Kouichi Ichimura; Takayoshi Kobayashi

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
497 KB
Volume
162
Category
Article
ISSN
0009-2614

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✦ Synopsis

Time-resolved absorption spectroscopy was applied to the triplet species produced by anthracene-sensitized flash photolysis of the all-trans, 7-c&, 9-c& 13-c& and 1 S-cis isomers of g-carotene. Upon triplet excitation, the a&trans and 154s 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 fmal ground-state isomers, excitation from and subsequent relaxation to the original isomer were seen for the all-tram, 74, and 9-cis isomers, while isomerization into the all-tram isomer was seen for the 13-cis and 15-cis isomers.

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Picosecond time-resolved absorption spectra of all-tram-and 9-cis-retinal in n-hexane solution have been measured by using an Nd3+:YAG laser photolysis system. A drastic change of the T,+T, absorption spectrum of the 9-cis isomer has been observed in the picosecond to nanosecond time region, which s