About: Two-Dimensional Electronic Spectroscopy Reveals Ultrafast Energy Diffusion in Chlorosomes

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Chlorosomes are light-harvesting antennae that enable exceptionally efficient light energy capture and excitation transfer. They are found in certain photosynthetic bacteria, some of which live in extremely low-light environments. In this work, chlorosomes from the green sulfur bacterium Chlorobaculum tepidum were studied by coherent electronic two-dimensional (2D) spectroscopy. Previously uncharacterized ultrafast energy transfer dynamics were followed, appearing as evolution of the 2D spectral line-shape during the first 200 fs after excitation. Observed initial energy flow through the chlorosome is well explained by effective exciton diffusion on a sub-100 fs time scale, which assures efficiency and robustness of the process. The ultrafast incoherent diffusion-like behavior of the excitons points to a disordered energy landscape in the chlorosome, which leads to a rapid loss of excitonic coherences between its structural subunits. This disorder prevents observation of excitonic coherences in the experimental data and implies that the chlorosome as a whole does not function as a coherent light-harvester. Chlorosomes are light-harvesting antennae that enable exceptionally efficient light energy capture and excitation transfer. They are found in certain photosynthetic bacteria, some of which live in extremely low-light environments. In this work, chlorosomes from the green sulfur bacterium Chlorobaculum tepidum were studied by coherent electronic two-dimensional (2D) spectroscopy. Previously uncharacterized ultrafast energy transfer dynamics were followed, appearing as evolution of the 2D spectral line-shape during the first 200 fs after excitation. Observed initial energy flow through the chlorosome is well explained by effective exciton diffusion on a sub-100 fs time scale, which assures efficiency and robustness of the process. The ultrafast incoherent diffusion-like behavior of the excitons points to a disordered energy landscape in the chlorosome, which leads to a rapid loss of excitonic coherences between its structural subunits. This disorder prevents observation of excitonic coherences in the experimental data and implies that the chlorosome as a whole does not function as a coherent light-harvester. (en)
Title	Two-Dimensional Electronic Spectroscopy Reveals Ultrafast Energy Diffusion in Chlorosomes Two-Dimensional Electronic Spectroscopy Reveals Ultrafast Energy Diffusion in Chlorosomes (en)
skos:prefLabel	Two-Dimensional Electronic Spectroscopy Reveals Ultrafast Energy Diffusion in Chlorosomes Two-Dimensional Electronic Spectroscopy Reveals Ultrafast Energy Diffusion in Chlorosomes (en)
skos:notation	RIV/60076658:12310/12:43883532!RIV13-MSM-12310___
http://linked.open...avai/riv/aktivita	P S V Z
http://linked.open...avai/riv/aktivity	P(GA206/09/0375), S, V, Z(MSM0021620835)
http://linked.open...iv/cisloPeriodika	28
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Vácha, František
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Jihočeská univerzita v Českých Budějovicích / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	175492
http://linked.open...ai/riv/idVysledku	RIV/60076658:12310/12:43883532
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	ORGANIZATION; BCHL-C; LINEAR DICHROISM; EXCITON DYNAMICS; FEMTOSECOND SPECTROSCOPY; CHLOROFLEXUS-AURANTIACUS; BACTERIOCHLOROPHYLL-C; CHLOROBIUM-TEPIDUM; LIGHT-HARVESTING CHLOROSOMES; GREEN PHOTOSYNTHETIC BACTERIA (en)
http://linked.open.../riv/klicoveSlovo	CHLOROFLEXUS-AURANTIACUS EXCITON DYNAMICS FEMTOSECOND SPECTROSCOPY GREEN PHOTOSYNTHETIC BACTERIA LIGHT-HARVESTING CHLOROSOMES LINEAR DICHROISM BACTERIOCHLOROPHYLL-C CHLOROBIUM-TEPIDUM BCHL-C ORGANIZATION
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[651D27BB9133]
http://linked.open...i/riv/nazevZdroje	JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
http://linked.open...in/vavai/riv/obor	CE
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	Self-assembling light-harvesting structures based on chlorosomes of green photosynthetic bacteria
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	134
http://linked.open...iv/tvurceVysledku	Vácha, František Augulis, Ramunas Dostal, Jakub Mancal, Tomas Psencik, Jakub Zigmantas, Donatas
http://linked.open...ain/vavai/riv/wos	000306457900050
http://linked.open...n/vavai/riv/zamer	Fyzika molekulárních, makromolekulárních a biologických systémů
issn	0002-7863
number of pages	7 (xsd:int)
http://bibframe.org/vocab/doi	10.1021/ja3025627
http://localhost/t...ganizacniJednotka	12310

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