Radical Cation Generation from Singlet and Triplet Excited States of All-trans-Lycopene in Chloroform¶

From: Photochemistry and Photobiology | Date: September 1, 2004| Author: Ai, Xi-Cheng; Et al; Feng, Juan; Wu, Yi-Shi; Han, Rui-Min | Copyright information

ABSTRACT

On direct photoexcitation, subpicosecond time-resolved absorption spectroscopy revealed that the 1B^sub u^-type singlet excited state of all-trans-lycopene in chloroform was about seven times more efficient than all-trans-β-carotene in generating the radical cation. The time constant of radical cation generation from the 1B^sub u^-type state was found to be ~0.14 ps, a value that was comparable for the two carotenoids. On anthracene-sensitized triplet excitation, radical ...

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