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Triplet-state dynamics in Chl-a/Per mixtures in organic solvent and in native H-PCP were studied by means of step-scan FTIR spectroscopy. A single decay component of 10μs was observed for the H-PCP triplet, the spectrum of which closely matches the 13μs component of A-PCP [Alexandre et al., Biophysical Journal 93 (2007) 2118–2128], implying that in H-PCP, as in A-PCP, the peridinin triplet state is...
Trimers of light harvesting complex II from Arabidopsis thaliana were studied by femtosecond fluorescence upconversion. The average lifetime of the carotenoid S 2 state was ~57 fs for wild type trimers and ~70 fs for trimers from a mutant plant with a distinctly different carotenoid composition. We estimate that ~56% of the energy transferred from carotenoids to chlorophylls proceeds via the...
Purpose: Two spectral components, denoted BChl 796 and BChl 806, can be discerned in the BChl 800 band of LH2 complexes of Chr. tepidum. The nature of these components is investigated.Methods: Polarized two-color femtosecond pump-probe spectroscopyResults: Selective excitation of the BChl 806 band leads to a bleaching centered at 810 nm. Subsequently, energy transfer to BChl 850 takes place in 1.0...
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