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Potential pitfalls of the early-time dynamics in two-dimensional electronic spectroscopy

Journal article
Authors D. Paleček
Petra Edlund
Emil Gustavsson
Sebastian Westenhoff
D. Zigmantas
Published in Journal of Chemical Physics
Volume 151
Issue 2
ISSN 0021-9606
Publication year 2019
Published at Department of Chemistry and Molecular Biology
Language en
Links dx.doi.org/10.1063/1.5079817
Keywords Energy transfer, Cutting edges, Electronic coherence, Molecular aggregate, Pulse overlap, Spectral signature, Time dynamic, Time-scales, Two-dimensional electronic spectroscopies, Polarization, article, artifact, kinetics, spectroscopy
Subject categories Kinetics

Abstract

Two-dimensional electronic spectroscopy, and especially the polarization-controlled version of it, is the cutting edge technique for disentangling various types of coherences in molecules and molecular aggregates. In order to evaluate the electronic coherences, which often decay on a 100 fs time scale, the early population times have to be included in the analysis. However, signals in this region are typically plagued by several artifacts, especially in the unavoidable pulse overlap region. In this paper, we show that, in the case of polarization-controlled two-dimensional spectroscopy experiment, the early-time dynamics can be dominated by the "incorrect" pulse ordering signals. These signals can affect kinetics at positive times well beyond the pulse overlap region, especially when the "correct" pulse ordering signals are much weaker. Moreover, the "incorrect" pulse ordering contributions are oscillatory and overlap with the spectral signatures of energy transfer, which may lead to misinterpretation of "incorrect" pulse ordering signals for fast-decaying coherences. © 2019 Author(s).

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