Fluorescence-Detected Wavepacket Interferometry Reveals Time-Varying Exciton Relaxation Pathways in Single Light-Harvesting Complexes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388971%3A_____%2F25%3A00641316" target="_blank" >RIV/61388971:_____/25:00641316 - isvavai.cz</a>
Result on the web
<a href="https://pubs.acs.org/doi/10.1021/jacs.5c12416" target="_blank" >https://pubs.acs.org/doi/10.1021/jacs.5c12416</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/jacs.5c12416" target="_blank" >10.1021/jacs.5c12416</a>
Alternative languages
Result language
angličtina
Original language name
Fluorescence-Detected Wavepacket Interferometry Reveals Time-Varying Exciton Relaxation Pathways in Single Light-Harvesting Complexes
Original language description
Photosynthesis relies on efficient energy relaxation within the excited-state manifold of pigment-protein complexes. Since the protein scaffold is rather flexible, the resulting energetic and structural disorder gives rise to a complex excited-state energy level structure that fluctuates on all time scales. Although the impact of such fluctuations on relaxation processes is known, the precise exciton states involved in relaxation as well as the nature of the vibrational modes driving relaxation are under debate. Here, single pigment-protein complexes from a photosynthetic purple bacterium are excited with two identical ultrashort phase-locked pulses, producing two exciton wave packets that can interfere. This leads to a modulation of the emission intensity as a function of the delay time between the pulses that fades out within about approximate to 100 fs due to fluctuating environments on those time scales. For several single complexes, we find variations in the interference patterns on a time scale of several tens of seconds that reveal fluctuations in the energy relaxation pathways toward the lowest-energy exciton states. This relaxation is driven by temporal variations in the coupling between electronic excitations and low-frequency vibrational modes.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10606 - Microbiology
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of the American Chemical Society
ISSN
0002-7863
e-ISSN
1520-5126
Volume of the periodical
147
Issue of the periodical within the volume
44
Country of publishing house
US - UNITED STATES
Number of pages
10
Pages from-to
40537-40546
UT code for WoS article
001597399400001
EID of the result in the Scopus database
2-s2.0-105020674063