Excitation Energy Transfer in Photosynthetic Systems
(2014) KEMP39 20132Department of Chemistry
- Abstract
- The excitation energy transfer properties of dimer systems and the light harvesting complex 2 of purple bacteria are investigated using the hierarchy equations of motion approach. While the bacteriochlorophyll molecules are modeled as electronic two level systems applying the Frenkel exciton Hamiltonian, intramolecular vibrations and environmental uctuations are included via an experimental and model spectral densities. A Fourier analysis method is used to unveil the origin of oscillatory features in the evolution of the populations and coherences of the reduced density matrix. It is demonstrated that the underlying vibronic level structure is directly responsible for the observed long living oscillations.
- Popular Abstract
- The photosynthesis of plants, algae and purple bacteria is a highly ecient process. Light, collected by huge antenna systems, is transfered via excitation energy transfer to the reaction center, where the energy is used to drive chemical reactions. Recent experiments gave rise to a discussion whether the transfer eciency is enhanced via a wavelike character of the transfer through a system. We investigate the transfer step in the light harvesting complex 2 of purple bacteria on the basis of reduced models, using the hierarchy equations of motion approach. This approach is highly ecient and allows an in principle exact description of the whole system which makes it possible to have a closer look at the origins of the experimental results.... (More)
- The photosynthesis of plants, algae and purple bacteria is a highly ecient process. Light, collected by huge antenna systems, is transfered via excitation energy transfer to the reaction center, where the energy is used to drive chemical reactions. Recent experiments gave rise to a discussion whether the transfer eciency is enhanced via a wavelike character of the transfer through a system. We investigate the transfer step in the light harvesting complex 2 of purple bacteria on the basis of reduced models, using the hierarchy equations of motion approach. This approach is highly ecient and allows an in principle exact description of the whole system which makes it possible to have a closer look at the origins of the experimental results. Our results indicate that vibrations of the molecules and the environment play an important role in the underlying mechanisms. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/4780491
- author
- Schröter, Marco LU
- supervisor
- organization
- course
- KEMP39 20132
- year
- 2014
- type
- L3 - Miscellaneous, Projetcs etc.
- subject
- keywords
- kemisk fysik, chemical physics
- language
- English
- id
- 4780491
- date added to LUP
- 2014-11-19 12:03:37
- date last changed
- 2014-11-19 12:03:37
@misc{4780491, abstract = {{The excitation energy transfer properties of dimer systems and the light harvesting complex 2 of purple bacteria are investigated using the hierarchy equations of motion approach. While the bacteriochlorophyll molecules are modeled as electronic two level systems applying the Frenkel exciton Hamiltonian, intramolecular vibrations and environmental uctuations are included via an experimental and model spectral densities. A Fourier analysis method is used to unveil the origin of oscillatory features in the evolution of the populations and coherences of the reduced density matrix. It is demonstrated that the underlying vibronic level structure is directly responsible for the observed long living oscillations.}}, author = {{Schröter, Marco}}, language = {{eng}}, note = {{Student Paper}}, title = {{Excitation Energy Transfer in Photosynthetic Systems}}, year = {{2014}}, }