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J Phys Chem A. 2013 Jul 25;117(29):6007-14. doi: 10.1021/jp3119605. Epub 2013 Mar 18.

Vibronic and vibrational coherences in two-dimensional electronic spectra of supramolecular J-aggregates.

Author information

1
Photonics Institute, Vienna University of Technology, Gusshausstrasse 27, 1040 Vienna, Austria.

Abstract

In J-aggregates of cyanine dyes, closely packed molecules form mesoscopic tubes with nanometer-diameter and micrometer-length. Their efficient energy transfer pathways make them suitable candidates for artificial light harvesting systems. This great potential calls for an in-depth spectroscopic analysis of the underlying energy deactivation network and coherence dynamics. We use two-dimensional electronic spectroscopy with sub-10 fs laser pulses in combination with two-dimensional decay-associated spectra analysis to describe the population flow within the aggregate. Based on the analysis of Fourier-transform amplitude maps, we distinguish between vibrational or vibronic coherence dynamics as the origin of pronounced oscillations in our two-dimensional electronic spectra.

PMID:
23461650
PMCID:
PMC3725611
DOI:
10.1021/jp3119605
[Indexed for MEDLINE]
Free PMC Article

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