Ultrafast energy relaxation in single light-harvesting complexes
- Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, 1081HV Amsterdam, The Netherlands,, Institute of Physics, Faculty of Mathematics and Physics, Charles University in Prague, 121 16 Prague, Czech Republic,
- Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, 1081HV Amsterdam, The Netherlands,
- Institute of Molecular, Cellular and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G128QQ, United Kingdom
- Institute of Physics, Faculty of Mathematics and Physics, Charles University in Prague, 121 16 Prague, Czech Republic,
Significance
The excitation energy transfer in light-harvesting complexes is usually studied either by ultrafast bulk spectroscopy or by single-molecule spectroscopy. These methods are to a high degree complementary: Bulk spectroscopy measures ultrafast processes averaged over thousands of complexes, whereas single-molecule spectroscopy observes much slower dynamics in individual complexes. In this work, we combine these approaches using a recently developed ultrafast single-molecule spectroscopy technique. This enables us, for the first time (to our knowledge), to observe ultrafast energy relaxation with a rate around 100 fs in individual light-harvesting complexes. We determine the distribution of the relaxation times, observe changes of the relaxation time in one complex, and find how the relaxation depends on excitation wavelength.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- SC0001035
- OSTI ID:
- 1238807
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 11 Vol. 113; ISSN 0027-8424
- Publisher:
- Proceedings of the National Academy of SciencesCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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