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Transient two-dimensional infrared spectroscopy (2D-IR) on a charge transfer model system is used as a nonlinear probe of solvation dynamics. Unlike what is expected in the linear response case, nonequilibrium relaxation and equilibrium spectral diffusion occur on different time scales. Transient 2D-IR spectroscopy is shown to be sensitive to higher order frequency fluctuation correlation functions, and provides evidence for a coupling between commonly observed fast and slow solvation processes.
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Bredenbeck et al. (2005) studied this question.
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