Abstract
Light-harvesting complex II (LHCII) – the light-harvesting antenna of Photosystem II – is a naturally abundant system that plays an important role in photosynthesis. In this study, we present a phenomenological analysis of the excitonic energy transfer in LHCII using ultrafast two-dimensional electronic spectroscopy, that we find compares well with previous theoretical and experimental results.
Highlights
Light-harvesting complex II (LHCII) is the most abundant light-harvesting antenna in the biosphere
LHCII exists in nature mainly as a trimer, and each monomeric unit contains 8 chlorophylls a, 6 chlorophylls b and xantophylls, pigments that are bound by three transmembrane α helices
To elucidate the ultrafast energy transfer (EET) network in LHCII, we use two-dimensional electronic spectroscopy (2DES), implemented in a pump-probe geometry aided by an acousto-optic programmable dispersive filter [2]. 2DES with an additional spectral dimension compared to conventional transient absorption spectra is a powerful technique that is widely used to investigate ultrafast phenomena in various systems [3]
Summary
Light-harvesting complex II (LHCII) is the most abundant light-harvesting antenna in the biosphere. The orientations of the pigments are optimized to enable ultrafast excitonic energy transfer (EET) processes that happen in the femtosecond to picosecond timescales [1]. To elucidate the ultrafast EET network in LHCII, we use two-dimensional electronic spectroscopy (2DES), implemented in a pump-probe geometry aided by an acousto-optic programmable dispersive filter [2].
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