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Unveiling the excited state energy transfer pathways in peridinin-chlorophyll a-protein by ultrafast multi-pulse transient absorption spectroscopy

Redeckas, Kipras; Voiciuk, Vladislava; Zigmantas, Donatas LU ; Hiller, Roger G. and Vengris, Mikas (2017) In Biochimica et Biophysica Acta - Bioenergetics 1858(4). p.297-307
Abstract

Time-resolved multi-pulse methods were applied to investigate the excited state dynamics, the interstate couplings, and the excited state energy transfer pathways between the light-harvesting pigments in peridinin-chlorophyll a-protein (PCP). The utilized pump-dump-probe techniques are based on perturbation of the regular PCP energy transfer pathway. The PCP complexes were initially excited with an ultrashort pulse, resonant to the S0 → S2 transition of the carotenoid peridinin. A portion of the peridinin-based emissive intramolecular charge transfer (ICT) state was then depopulated by applying an ultrashort NIR pulse that perturbed the interaction between S1 and ICT states and the energy flow from the... (More)

Time-resolved multi-pulse methods were applied to investigate the excited state dynamics, the interstate couplings, and the excited state energy transfer pathways between the light-harvesting pigments in peridinin-chlorophyll a-protein (PCP). The utilized pump-dump-probe techniques are based on perturbation of the regular PCP energy transfer pathway. The PCP complexes were initially excited with an ultrashort pulse, resonant to the S0 → S2 transition of the carotenoid peridinin. A portion of the peridinin-based emissive intramolecular charge transfer (ICT) state was then depopulated by applying an ultrashort NIR pulse that perturbed the interaction between S1 and ICT states and the energy flow from the carotenoids to the chlorophylls. The presented data indicate that the peridinin S1 and ICT states are spectrally distinct and coexist in an excited state equilibrium in the PCP complex. Moreover, numeric analysis of the experimental data asserts ICT → Chl-a as the main energy transfer pathway in the photoexcited PCP systems.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Excitation energy transfer, Excited state equilibrium, Intramolecular charge transfer, Peridinin-chlorophyll a-protein, Pump-dump-probe, Pump-probe
in
Biochimica et Biophysica Acta - Bioenergetics
volume
1858
issue
4
pages
11 pages
publisher
Elsevier
external identifiers
  • scopus:85012149155
  • wos:000397369900004
ISSN
0005-2728
DOI
10.1016/j.bbabio.2017.01.014
language
English
LU publication?
yes
id
10531d8f-e68a-41db-b213-0dc89062cb8b
date added to LUP
2017-02-22 12:03:39
date last changed
2018-04-29 04:36:28
@article{10531d8f-e68a-41db-b213-0dc89062cb8b,
  abstract     = {<p>Time-resolved multi-pulse methods were applied to investigate the excited state dynamics, the interstate couplings, and the excited state energy transfer pathways between the light-harvesting pigments in peridinin-chlorophyll a-protein (PCP). The utilized pump-dump-probe techniques are based on perturbation of the regular PCP energy transfer pathway. The PCP complexes were initially excited with an ultrashort pulse, resonant to the S<sub>0</sub> → S<sub>2</sub> transition of the carotenoid peridinin. A portion of the peridinin-based emissive intramolecular charge transfer (ICT) state was then depopulated by applying an ultrashort NIR pulse that perturbed the interaction between S<sub>1</sub> and ICT states and the energy flow from the carotenoids to the chlorophylls. The presented data indicate that the peridinin S<sub>1</sub> and ICT states are spectrally distinct and coexist in an excited state equilibrium in the PCP complex. Moreover, numeric analysis of the experimental data asserts ICT → Chl-a as the main energy transfer pathway in the photoexcited PCP systems.</p>},
  author       = {Redeckas, Kipras and Voiciuk, Vladislava and Zigmantas, Donatas and Hiller, Roger G. and Vengris, Mikas},
  issn         = {0005-2728},
  keyword      = {Excitation energy transfer,Excited state equilibrium,Intramolecular charge transfer,Peridinin-chlorophyll a-protein,Pump-dump-probe,Pump-probe},
  language     = {eng},
  month        = {04},
  number       = {4},
  pages        = {297--307},
  publisher    = {Elsevier},
  series       = {Biochimica et Biophysica Acta - Bioenergetics},
  title        = {Unveiling the excited state energy transfer pathways in peridinin-chlorophyll a-protein by ultrafast multi-pulse transient absorption spectroscopy},
  url          = {http://dx.doi.org/10.1016/j.bbabio.2017.01.014},
  volume       = {1858},
  year         = {2017},
}