Comparison of the Excited-State Dynamics of Five- and Six-Chlorophyll Photosystem II Reaction Center Complexes

Content Provider	Semantic Scholar
Author	Hartog, F. T. H. Den Vácha, František Lock, Arjan J. Barber, James Dekker, Jan P. Voelker, Susanne
Copyright Year	1998
Abstract	Spectral hole-burning experiments have been performed at liquid He temperature on the Qy-band of isolated reaction center complexes of photosystem II (PS II RC) containing five (RC-5) and six (RC-6) chlorophyll a (Chl a) molecules. The aim was to investigate the nature of the redmost shoulder in the absorption spectrum of RC-5 and to identify distributions of “trap” pigments. The “effective” homogeneous line width was measured at 682 nm as a function of temperature between 1.2 and 4.2 K. It follows a T1.3±0.1 power law in both complexes and extrapolates to the fluorescence lifetime-limited value, τfl = (4 ± 1) ns, for T → 0. These results indicate that the redmost absorbing pigments act as “traps” for the excitation energy. The spectral distribution of these traps was reconstructed from the hole depth measured as a function of excitation wavelength λexc and compared to that of RC-6 previously obtained by us (Groot, M. L.; et al. J. Phys. Chem. 1996, 100, 11488). The maximum of the RC-5 trap distribution l...
Starting Page	9174
Ending Page	9180
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1021/jp982791l
Alternate Webpage(s)	https://www.nat.vu.nl/en/Images/98-15_tcm208-86146.pdf
Alternate Webpage(s)	https://doi.org/10.1021/jp982791l
Volume Number	102
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article