| Autor: |
Richards GH, Wilk KE; ‡School of Physics and Centre for Applied Medical Research, St Vincents Hospital, The University of New South Wales, Sydney, New South Wales 2052, Australia., Curmi PM; ‡School of Physics and Centre for Applied Medical Research, St Vincents Hospital, The University of New South Wales, Sydney, New South Wales 2052, Australia., Davis JA |
| Jazyk: |
angličtina |
| Zdroj: |
The journal of physical chemistry letters [J Phys Chem Lett] 2014 Jan 02; Vol. 5 (1), pp. 43-9. Date of Electronic Publication: 2013 Dec 09. |
| DOI: |
10.1021/jz402217j |
| Abstrakt: |
Energy transfer between chromophores in photosynthesis proceeds with near-unity quantum efficiency. Understanding the precise mechanisms of these processes is made difficult by the complexity of the electronic structure and interactions with different vibrational modes. Two-dimensional spectroscopy has helped resolve some of the ambiguities and identified quantum effects that may be important for highly efficient energy transfer. Many questions remain, however, including whether the coherences observed are electronic and/or vibrational in nature and what role they play. We utilize a two-color, four-wave mixing experiment with control of the wavelength and polarization to selectively excite specific coherence pathways. For the light-harvesting complex PC645, from cryptophyte algae, we reveal and identify specific contributions from both electronic and vibrational coherences and determine an excited-state structure based on two strongly coupled electronic states and two vibrational modes. Separation of the coherence pathways also uncovers the complex evolution of these coherences and the states involved. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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