Journal Article

PUBDB-2016-03186

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Two-Dimensional Spectroscopy of a Molecular Dimer Unveils the Effects of Vibronic Coupling on Exciton Coherences

Halpin, A. ; Johnson, P. J. M. ; Tempelaar, R. ; Murphy, R. S. ; Knoester, J. ; Jansen, T. L. C. ; Miller, R. J. D. (Corresponding author)Extern*

2014
Nature Publishing Group London

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Please use a persistent id in citations: doi:10.1038/nchem.1834

Abstract: The observation of persistent oscillatory signals in multidimensional spectra of protein–pigment complexes has spurred a debate on the role of coherence-assisted electronic energy transfer as a key operating principle in photosynthesis. Vibronic coupling has recently been proposed as an explanation for the long lifetime of the observed spectral beatings. However, photosynthetic systems are inherently complicated, and tractable studies on simple molecular compounds are needed to fully understand the underlying physics. In this work, we present measurements and calculations on a solvated molecular homodimer with clearly resolvable oscillations in the corresponding two-dimensional spectra. Through analysis of the various contributions to the nonlinear response, we succeed in isolating the signal due to inter-exciton coherence. We find that although calculations predict a prolongation of this coherence due to vibronic coupling, the combination of dynamicdisorder and vibrational relaxation leads to a coherence decay on a timescale comparable to the electronic dephasing time.

Note: (c) Macmillan Publishers Limited. No post referee full text available.

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Contributing Institute(s):

1. Forschungsgruppe für strukturelle Dynamik (MPSD)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

Experiment(s):

1. No specific instrument

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