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- W2116726825 abstract "Traditional second-order kinetic theories fail to describe sub-picosecond photochemical reactions when solvation and vibrational dephasing undermine the assumption of equilibrium initial conditions. Four-wave mixing spectroscopies may reveal insights into such non-equilibrium processes but are limited by the single population time available in these types of experiments. Here, we use two-dimensional resonance Raman (2DRR) spectroscopy to expose correlations between coherent nuclear motions of the reactant and product in the photodissociation reaction of triiodide. It is shown that the transition of a nuclear wavepacket from the reactant (triiodide) to product (diiodide) states gives rise to a unique pattern of 2DRR resonances. Peaks associated with this coherent reaction mechanism are readily assigned, because they are isolated in particular quadrants of the 2DRR spectrum. A theoretical model in which the chemical reaction is treated as a vibronic coherence transfer transition from triiodide to diiodide reproduces the patterns of 2DRR resonances detected in experiments. These signal components reveal correlation between the nonequilibrium geometry of triiodide and the vibrational coherence frequency of diiodide. The 2DRR signatures of coherent reaction mechanisms established in this work may generalize to studies of ultrafast energy and charge transfer processes." @default.
- W2116726825 created "2016-06-24" @default.
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- W2116726825 date "2015-09-28" @default.
- W2116726825 modified "2023-10-14" @default.
- W2116726825 title "Elucidation of reactive wavepackets by two-dimensional resonance Raman spectroscopy" @default.
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- W2116726825 doi "https://doi.org/10.1063/1.4931473" @default.
- W2116726825 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26429002" @default.
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