Superradiance and Exciton (De)localization in Light-Harvesting Complex II from Green Plants?

Fluorescence quantum yield and fluorescence lifetime measurements were performed on trimeric light-harvesting complex II (LHCII) from spinach in the temperature range 7−293 K. From the results the radiative rate was calculated, which is related to the amount of delocalization of excitations over dif...

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Published inThe journal of physical chemistry. B Vol. 106; no. 22; pp. 5782 - 5787
Main Authors Palacios, Miguel A, de Weerd, Frank L, Ihalainen, Janne A, van Grondelle, Rienk, van Amerongen, Herbert
Format Journal Article
LanguageEnglish
Published American Chemical Society 06.06.2002
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Summary:Fluorescence quantum yield and fluorescence lifetime measurements were performed on trimeric light-harvesting complex II (LHCII) from spinach in the temperature range 7−293 K. From the results the radiative rate was calculated, which is related to the amount of delocalization of excitations over different pigments because of intermolecular interactions. The emitting dipole strength of LHCII is very similar to that of unbound Chl a, and it appears to be almost independent of temperature. The apparent increase of the radiative rate upon lowering the temperature can largely be explained by the shrinking of the sample. It is concluded that at all temperatures the amount of exciton delocalization in LHCII is small.
Bibliography:ark:/67375/TPS-67K1KGWV-2
istex:354C7BA9812E6664A491A553EB057347B954F470
Abbreviations.  PSII, photosystem II; Chl a, chlorophyll a; Chl b, chlorophyll b; fwhm, full width at half-maximum; LHCII, light-harvesting complex II; n, refractive index; OD, optical density; RT, room temperature; ACE, acetone; MeOH, methanol; krad, radiative rate.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp014078t