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Analysis of S2QA- charge recombination with the Arrhenius, Eyring and Marcus theories

Paper ID Volume ID Publish Year Pages File Format Full-Text
29634 44425 2011 9 PDF Available
Title
Analysis of S2QA- charge recombination with the Arrhenius, Eyring and Marcus theories
Abstract

The Q band of photosynthetic thermoluminescence, measured in the presence of a herbicide that blocks electron transfer from PSII, is associated with recombination of the S2QA- charge pair. The same charge recombination reaction can be monitored with chlorophyll fluorescence. It has been shown that the recombination occurs via three competing routes of which one produces luminescence. In the present study, we measured the thermoluminescence Q band and the decay of chlorophyll fluorescence yield after a single turnover flash at different temperatures from spinach thylakoids. The data were analyzed using the commonly used Arrhenius theory, the Eyring rate theory and the Marcus theory of electron transfer. The fitting error was minimized for both thermoluminescence and fluorescence by adjusting the global, phenomenological constants obtained when the reaction rate theories were applied to the multi-step recombination reaction. For chlorophyll fluorescence, all three theories give decent fits. The peak position of the thermoluminescence Q band is correct by all theories but the form of the Q band is somewhat different in curves predicted by the three theories. The Eyring and Marcus theories give good fits for the decreasing part of the thermoluminescence curve and Marcus theory gives the closest fit for the rising part.

► Thermoluminescence and fluorescence can be analysed with the same model. ► Arrhenius, Eyring and Marcus theories can be applied. ► Analysis yields global parameters rather than reaction-specific rate constants.

Keywords
Arrhenius equation; Charge recombination; Eyring theory; Marcus theory; Photosystem II; Q band
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Analysis of S2QA- charge recombination with the Arrhenius, Eyring and Marcus theories
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 104, Issues 1–2, July–August 2011, Pages 292–300
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us