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- W1539931145 abstract "When the spectral shift accompanying formation of a photoproduct is small compared with the full width at half-maximum (FWHM) of the reactant absorption band, direct estimation of the extent of phototransformation becomes impossible. In this paper a method is described for calculating quantum yields and the photoproduct spectrum for photo-reversible photochromic reactions which bypasses the need for estimation of the extent of phototransformation. It is based on an analysis of the dependence of absorption changes on excitation dose from the initial quasi-linear region up to full saturation. The measurements are carried out with only one constant testing wavelength which is chosen near the maximum in the differential spectrum between the two states (to improve the signal-to-noise ratio). Different excitation wavelengths from the region of overlap between the reactant and photoproduct absorption bands are used. Analytical formulae which take into account the variation in the absorption of both the reactant and photoproduct during the excitation are derived for calculating quantum yields and the photoproduct spectrum. Only the initial reactant spectrum and parameters of the absorption change vs. excitation curves are used for calculation. The method was derived to calculate the quantum yields of the forward and reverse reactions and the spectrum of a transient photoproduct with a time resolution equal to the excitation flash duration. In an accompanying paper it is used to characterize the processes of bathointermediate formation in the photocycle of bacteriorhodopsin at room temperature." @default.
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- W1539931145 date "1989-06-01" @default.
- W1539931145 modified "2023-09-27" @default.
- W1539931145 title "Quantum yield and extinction measurements in strongly overlapping reactant and photoproduct absorption bands" @default.
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- W1539931145 doi "https://doi.org/10.1016/1011-1344(89)80043-0" @default.
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