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.

J. Phys. Chem. A
Ultrafast Spectroscopy

Kropman, M. F., Nienhuys, H.-K., Woutersen, S., & Bakker, H. (2001). Vibrational relaxation and hydrogen-bond dynamics of HDO:H2O. J. Phys. Chem. A, 105, 4622–4626. doi:10.1021/jp010057n