Abstract
Femtosecond two-color mid-infrared pump−probe spectroscopy is used to study the vibrational relaxation and the hydrogen-bond dynamics of HDO dissolved in liquid H2O. By looking at the spectral dynamics of the OD stretch mode, direct information on the hydrogen-bond dynamics of the H2O solvent is obtained. By fitting the data using the Brownian oscillator model, we determined the vibrational lifetime of the OD stretch vibration and the hydrogen-bond length correlation time. The hydrogen-bond correlation time of H2O is significantly shorter than for D2O, found previously.
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