ISSN:
1573-5079
Keywords:
absorption
;
Kennard–Stepanov theory
;
photosynthesis
;
spectral equilibration
;
thermal equilibration
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Absorption and fluorescence spectra of chlorophyll a have been analyzed on the basis of an extended version of Kennard–Stepanov (KS) theory. It is proposed that at least one new electronic state lies just below the normal S1 − S0 transition (Qy), borrowing approximately 2–4% of its strength and contributing to the fluorescence in the tail. The KS anomalies leading to this hypothesis occur in a wide variety of cases, including chlorophyll a in solution and protein-bound chlorophyll a, suggesting that the phenomenon is an intrinsic property of the molecule. Natural candidates for the new state(s) are the second and third triplet states. The relationship of the fluorescence excitation spectrum to KS theory is investigated and applied to explain a red drop in yield.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1006284510090
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