| Abstract [eng] |
The summary of doctoral dissertation presents the investigation of excitation energy transfer, studied in an excitonic dimer under various conditions of inter-chromophore resonance interaction and in different regimes of the system-bath coupling. The manifestation of quantum coherence in the energy transfer in molecular dimer is considered within the hierarchy of the relaxation processes: vibrational relaxation, energy redistribution within single exciton manifold and relaxation to the ground state. A new method to capture the coherence effects in the limit of weak resonance interaction is presented. The study of an excitonic heterodimer under various system-bath coupling conditions, which revealed both coherent and incoherent excitation evolutions, is summarized. An outline of the study of the relaxation of the excitonic dimer to the ground state is given, which revealed that the resonance coupling strength and the energy gap between the states control the rate of the process but not the character. The dissipation mechanism in the artificial carotenoid-pthalocyanine dyads is explained, and the results may be helpful in determining the mechanism of energy dissipation during photosynthesis, known as the non-photochemical quenching. |
