{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Cohen Stuart TA"],"funding":["U.S. Department of Energy","Netherlands Organization for Scientific Research Chemical Sciences","Dutch Research Council (NWO)","European Commission's Seventh Framework Program","European Commission FP7","Biotechnology and Biological Sciences Research Council","Dutch Foundation for Earth and Life Sciences"],"pagination":["2226-33"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC3149263"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["100(9)"],"pubmed_abstract":["The dynamics of the excited states of the light-harvesting complexes LH1 and LH2 of Rhodobacter sphaeroides are governed, mainly, by the excitonic nature of these ring-systems. In a pump-dump-probe experiment, the first pulse promotes LH1 or LH2 to its excited state and the second pulse dumps a portion of the excited state. By selective dumping, we can disentangle the dynamics normally hidden in the excited-state manifold. We find that by using this multiple-excitation technique we can visualize a 400-fs reequilibration reflecting relaxation between the two lowest exciton states that cannot be directly explored by conventional pump-probe. An oscillatory feature is observed within the exciton reequilibration, which is attributed to a coherent motion of a vibrational wavepacket with a period of ∼150 fs. Our disordered exciton model allows a quantitative interpretation of the observed reequilibration processes occurring in these antennas."],"journal":["Biophysical journal"],"pubmed_title":["Direct visualization of exciton reequilibration in the LH1 and LH2 complexes of Rhodobacter sphaeroides by multipulse spectroscopy."],"pmcid":["PMC3149263"],"funding_grant_id":["700-53-307","228334","834-01-002","BB/G021546/1","FP7_228334","DE-SC 0001035"],"pubmed_authors":["Hunter CN","Novoderezhkin VI","Cogdell RJ","van Grondelle R","Cohen Stuart TA","Vengris M"],"additional_accession":[]},"is_claimable":false,"name":"Direct visualization of exciton reequilibration in the LH1 and LH2 complexes of Rhodobacter sphaeroides by multipulse spectroscopy.","description":"The dynamics of the excited states of the light-harvesting complexes LH1 and LH2 of Rhodobacter sphaeroides are governed, mainly, by the excitonic nature of these ring-systems. In a pump-dump-probe experiment, the first pulse promotes LH1 or LH2 to its excited state and the second pulse dumps a portion of the excited state. By selective dumping, we can disentangle the dynamics normally hidden in the excited-state manifold. We find that by using this multiple-excitation technique we can visualize a 400-fs reequilibration reflecting relaxation between the two lowest exciton states that cannot be directly explored by conventional pump-probe. An oscillatory feature is observed within the exciton reequilibration, which is attributed to a coherent motion of a vibrational wavepacket with a period of ∼150 fs. Our disordered exciton model allows a quantitative interpretation of the observed reequilibration processes occurring in these antennas.","dates":{"release":"2011-01-01T00:00:00Z","publication":"2011 May","modification":"2025-04-21T13:53:36.056Z","creation":"2019-03-27T03:07:41Z"},"accession":"S-EPMC3149263","cross_references":{"pubmed":["21539791"],"doi":["10.1016/j.bpj.2011.02.048"]}}