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Early time solvation dynamics:

 

In condensed phase the solvent, without being just a mere spectator, dynamically controls the rates of many fundamental reactions (for example, electron transfer) at ultrafast time scale. The coordinated motion of solvents leads to population relaxation of the probe solute at various time scales. For solvation in bulk water, a substantial part of early time (<1 ps) solvation dynamics completes within <200 fs and hence is un-accessed by fluorescence-based techniques with hundreds of picoseconds resolution. This <200 fs component accounts for more than 50% of early time solvation and mediated via inertial solvent response. In recent times, focus has been made to explore the specific energy relaxation pathways associated with this component and the need of defining spectrum at time zero.

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Can we probe early time ultrafast solvation dynamics using femtosecond pump-probe and two-dimensional electronic spectroscopy?

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See our recent work on solvation dynamics probed by xanthenes dyes:

Chemical Physics Letters (Frontiers Article)