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- W2054706002 abstract "Abstract. The triplet-triplet absorption of all-trans and 11-cis retinal was measured as a function of the exciting radiation from 423 nm to 365 nm in a glass of 3-methylpentane at 77 K. This experiment was also accomplished with all-trans retinal in hexane at ambient temperature. The relative triplet formation quantum yields of all-trans and 11-cis retinal at 77 K were found to be independent (±10%) of the frequency of the exciting radiation. At room temperature we measured an increase in this relative quantum yield for all-trans retinal from 1.0 at 365 nm to 1.82 at 423 nm [Bensasson et al. (1975) measured an absolute quantum yield of 0.45 at 353 nm]. These results are used to evaluate previous interpretations for photophysical decay processes in all-trans retinal, and previous suggestions for wavelength dependent radiationless transitions are shown to be unacceptable. High energy excitation of 300 K solutions of all-trans retinal produce excited states that result in less efficient intersystem crossing. These states appear to be inaccessible in the 77 K matrices. We suggest that steric restrictions introduced by the retinal matrix interaction at 77 K are able to block this new internal conversion pathway back to the ground state." @default.
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- W2054706002 date "1977-12-01" @default.
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- W2054706002 title "DEPENDENCE OF THE TRIPLET YIELD ON EXCITATION ENERGY IN ALL-TRANS AND 11-CIS RETINAL*" @default.
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- W2054706002 doi "https://doi.org/10.1111/j.1751-1097.1977.tb07538.x" @default.
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