Solute-solvent interactions in liquids are studied by femtosecond vibrational spectroscopy. Upon electronic excitation, the C=O stretching band of an organic probe molecule, a coumarin dye, dissolved in CHCl₃ shows a strong blueshift on a 200 fs time scale. This demonstrates for the first time the cleavage of a site-specific intermolecular hydrogen bond with a polar solvent. After this fast process, the picosecond reorganization of the solvent due to dielectric relaxation is directly monitored via changes of the C=O vibrational frequency.
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Chudoba et al. (1998) studied this question.
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