Summary
In this chapter we discuss the transfer and trapping of excitation energy in the light-harvesting antenna of purple bacteria. The determination of high-resolution X-ray crystal structures of a variety of bacterial light-harvesting complexes has allowed an interpretation of the steady-state and time-resolved picosecond/femtosecond spectral responses of these complexes at a quantitative level using the disordered exciton model in combination with the generalized Förster and modified Redfield theories. Thus a consistent physical picture of energy transfer and trapping has been obtained including a precise assignment of the energy transfer pathways together with a direct visualization of the full excitation dynamics where various regimes ranging from coherent motion of the delocalized exciton to the hopping of localized excitations are superimposed. In a single complex it is possible to observe the switching between these regimes driven by slow conformational motions.
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Abbreviations
- B850, B800:
-
spectral bands with the 850 or 800 nm absorption
- BChl:
-
bacteriochlorophyll
- Blc. :
-
Blastochloris
- CD:
-
circular dichroism
- FL:
-
fluorescence
- LH1:
-
core light-harvesting complex of purple bacteria
- LH2:
-
peripheral light-harvesting complex of purple bacteria
- PR:
-
participation ratio
- Qy, Qx, By, Bx:
-
four electronic transitions of BChl
- Rba. :
-
Rhodobacter
- RC:
-
reaction center
- Rps. :
-
Rhodopseudomonas
- Rsp. :
-
Rhodospirillum
- TA:
-
transient absorption
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van Grondelle, R., Novoderezhkin, V.I. (2009). Spectroscopy and Dynamics of Excitation Transfer and Trapping in Purple Bacteria. In: Hunter, C.N., Daldal, F., Thurnauer, M.C., Beatty, J.T. (eds) The Purple Phototrophic Bacteria. Advances in Photosynthesis and Respiration, vol 28. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-8815-5_13
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