Distinguishing the roles of energy funnelling and delocalization in photosynthetic light harvesting

Baghbanzadeh, Sima and Kassal, Ivan (2016) Distinguishing the roles of energy funnelling and delocalization in photosynthetic light harvesting. Physical Chemistry Chemical Physics, 18 10: 7459-7467. doi:10.1039/C6CP00104A


Author Baghbanzadeh, Sima
Kassal, Ivan
Title Distinguishing the roles of energy funnelling and delocalization in photosynthetic light harvesting
Journal name Physical Chemistry Chemical Physics   Check publisher's open access policy
ISSN 1463-9076
1463-9084
Publication date 2016-02-02
Sub-type Article (original research)
DOI 10.1039/C6CP00104A
Open Access Status Not Open Access
Volume 18
Issue 10
Start page 7459
End page 7467
Total pages 9
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Collection year 2017
Language eng
Abstract Photosynthetic complexes improve the transfer of excitation energy from peripheral antennas to reaction centers in several ways. In particular, a downward energy funnel can direct excitons in the right direction, while coherent excitonic delocalization can enhance transfer rates through the cooperative phenomenon of supertransfer. However, isolating the role of purely coherent effects is difficult because any change to the delocalization also changes the energy landscape. Here, we show that the relative importance of the two processes can be determined by comparing the natural light-harvesting apparatus with counterfactual models in which the delocalization and the energy landscape are altered. Applied to the example of purple bacteria, our approach shows that although supertransfer does enhance the rates somewhat, the energetic funnelling plays the decisive role. Because delocalization has a minor role (and is sometimes detrimental), it is most likely not adaptive, being a side-effect of the dense chlorophyll packing that evolved to increase light absorption per reaction center.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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Created: Mon, 07 Mar 2016, 15:33:22 EST by Ivan Kassal on behalf of Physics