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Picosecond time-resolved fluorescence study of all-trans retinal. The existence of two fluorescent singlet excited states

✍ Scribed by Tahei Tahara; Hiro-o Hamaguchi

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
395 KB
Volume
234
Category
Article
ISSN
0009-2614

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✦ Synopsis

Picosecond time-resolved fluorescence spectra of all-trans retinal in hexane have been measured with 8 ps time-resolution with use of a highly sensitive streak camera. The observed fluorescence consists of a fast (r < 1 ps, ,h.ma x m 470 nm) and a slow (r = 33-34 ps, Ama x --540 nm) component. The lifetime of the slow component agrees well with the reported rise time of the triplet-triplet absorption. It is concluded that the photoexcitation first produces the optically allowed S 2 state and it relaxes to the optically forbidden S 1 state within 1 ps. The fast and slow fluorescence components are assigned to the S 2 and S I states, respectively.

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