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Excitation Energy Transfer in Light Harvesting Complex II Jiahao Chen December 15, 2004 PHYS 598 NSM
Plants as Transducers ,[object Object],[object Object],[object Object],M. Kamen,  Primary Processes in Photosynthesis , Academic Press: NY,  1963 . This study Light harvesting ~ 0.5 – 100 ps
Light Harvesting Complex II ,[object Object],[object Object],[object Object],[object Object],[object Object],LHC-II from spinach. PDB code 1RWT. Liu  et. al. ,  Nature ,  428 ,  2004 , 287-292.
Objectives ,[object Object],[object Object],[object Object],[object Object]
The Origin and Nature of Excitation ,[object Object],[object Object],[object Object],Ground state hole electron exciton Excited state occupied orbital empty orbital photon
How Energy is Transferred ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Different Spin Correlations! hole electron D onor A cceptor Dexter D onor A cceptor Förster
F örster Theory ,[object Object],[object Object],[object Object],[object Object],[object Object]
How to Quantify Efficiency ,[object Object],[object Object],[object Object],[object Object],[object Object]
Computational Procedure Atomic coordinates Distances between centers of mass:  R ij Identity: chlorophyll  a  v.  b Transition dipole strength,  f Orientation: k  factor Förster rate:  k ij Quantum yield,   Mean passage time:   results PDB literature parameters
Dipole-dipole couplings in LHC-II
Energy transfer rates for LHC-II (II) Fastest route Energy ends up sloshing between this pair
Results ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object]
Acknowledgements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Excitation Energy Transfer In Photosynthetic Membranes

  • 1. Excitation Energy Transfer in Light Harvesting Complex II Jiahao Chen December 15, 2004 PHYS 598 NSM
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9. Computational Procedure Atomic coordinates Distances between centers of mass: R ij Identity: chlorophyll a v. b Transition dipole strength, f Orientation: k factor Förster rate: k ij Quantum yield,  Mean passage time:  results PDB literature parameters
  • 11. Energy transfer rates for LHC-II (II) Fastest route Energy ends up sloshing between this pair
  • 12.
  • 13.
  • 14.