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Título : Effects of the distributions of energy or charge transfer rates on spectral hole burning in pigment-protein complexes at low temperatures
Autor : Herascu, Nicoleta; Ahmouda, Somaya; Picorel Castaño, Rafael ; Seibert, Michael; Jankowiak, Ryszard J.; Zazubovich, Valter
Palabras clave : photosynthesis
spectroscopy
CP43
photosystem II reaction center
Fecha de publicación : nov-2011
Editor: American Chemical Society
Citación : Herascu N, Ahmouda S, Picorel R, Siebert M, Jankowiak, RJ, Zazubovich V. Effects of the distributions of energy or charge transfer rates on spectral hole burning in pigment-protein complexes at low temperatures. Journal of Physical Chemistry B 115 (50): 15098–15109 (2011)
Resumen: Effects of the distributions of excitation energy transfer (EET) rates (homogeneous line widths) on the non-photochemical (resonant) spectral hole burning (SHB) processes in photosynthetic chlorophyll-protein complexes (reaction center [RC] and CP43 antenna of Photosystem II from spinach) are considered. It is demonstrated that inclusion of such a distribution results in somewhat more dispersive hole burning kinetics. More importantly, however, inclusion of the EET rate distributions strongly affects the dependence of the hole width on the fractional hole depth. Different types of line width distributions have been explored, including those resulting from Förster type EET between weakly interacting pigments as well as Gaussian ones, which may be a reasonable approximation for those resulting, for instance, from so-called extended Förster models. For Gaussian line width distributions it is possible to determine the parameters of both line width and tunneling parameter distributions from SHB data without a priori knowledge of any of them. Concerning more realistic asymmetric distributions, we demonstrate, using the simple example of CP43 antenna, that one can use SHB modeling to estimate electrostatic couplings between pigments and support or exclude assignment of certain pigment(s) to a particular state.
Descripción : 51 Pags, 2 Tabls., 7 Figs. The definitive version is available at: http://pubs.acs.org/journal/jpcbfk
Versión del editor: http://dx.doi.org/10.1021/jp208142k
URI : http://hdl.handle.net/10261/42607
DOI: 10.1021/jp208142k
ISSN: 1520-6106
E-ISSN: 1520-5207
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