English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/99894
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


How fast is excitation energy transfer in the photosystem II reaction center in the low temperature limit? Hole burning vs photon echo

AuthorsZazubovich, Valter; Jankowiak, Ryszard J.; Riley, Kerry J.; Picorel Castaño, Rafael ; Seibert, Michael; Small, Gerald J.
KeywordsPhoton echo spectroscopy
Photosystem reaction center
Primary charge transfer separation
Excitation energy transfer
Relaxation processes
Energy transfer
Charge transfer
Excitonic structure
Hole burning spectroscopy
Nonphotochemical hole burned spectra
Absorption spectroscopy
Issue Date27-Mar-2003
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry B 107 (12): 2862-2866 (2003)
AbstractThe Qy(S1) excitonic structure, excitation energy transfer (EET), and primary charge-transfer separation processes of the isolated photosystem II reaction center (PS II RC) have proven to be formidable problems due, in part, to the severe spectral congestion of the So → Qy absorption spectrum. Recently, Prokhorenko and Holzwarth (J. Phys. Chem. B 2000, 104, 11563) reported interesting femtosecond 2-pulse photon echo data on the RC at 1.3 K for excitation wavelengths between 676 and 686 nm. At times longer than ∼1 ps and λ ≳ 678 nm, the echo decay curves are highly dispersive, which was attributed to a distribution of primary charge separation rates ranging from 2 ps to several hundred ps. A prompt subpicosecond component of the echo decay curves was also observed and suggested to be due to EET occurring in ∼100-200 fs. We present here persistent nonphotochemical hole burned spectra and transient triplet bottleneck hole spectra obtained with burn wavelengths between 680 and 686 nm, which show that the EET time in that wavelength region is no shorter than ∼5-10 ps. It is argued that the prompt component of the echo decay curves is due to relaxation of low-frequency phonons excited by the pump pulse. The argument is based on hole burning spectroscopy being the frequency domain equivalent of 2-photon echo spectroscopy, as well as on published photon echo data for chromophores in amorphous hosts.
Publisher version (URL)http://dx.doi.org/10.1021/jp022231t
Identifiersdoi: 10.1021/jp022231t
issn: 1089-5647
Appears in Collections:(EEAD) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.