8-12 July 2013
Africa/Johannesburg timezone
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Femtosecond spectroscopy of the carotenoids in the main light-harvesting complex of plants

Presented by Mr. Joshua BOTHA on 9 Jul 2013 from 11:10 to 11:30
Type: Oral Presentation
Session: Applied
Track: Track F - Applied Physics

Abstract

The first step in photosynthesis constitutes highly efficient light harvesting and energy transfer in a set of membrane-bound pigment-protein complexes. One surprising aspect of the light-harvesting complexes of plants is that they are self-protected against damage due to over-illumination. A major component of the self-protection mechanism involves efficient switching between light-harvesting and energy-dissipating states. The role of the embedded carotenoids in this switching process is only little understood. Here, the excited-state dynamics of the carotenoids in the main light-harvesting complex of plants was investigated by performing a multi-colour, intensity-dependent femtosecond pump-probe study. It will be demonstrated how using this technique new electronic states can be resolved and how these states may be active in energy-quenching mechanisms.

Award

No

Level

Hons

Supervisor

T P J. Krüger, Tjaart.Kruger@up.ac.za University of Pretoria

Paper

Yes

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