Physical and chemical properties of liquid water are dominated by hydrogen bond structure and dynamics. Recent studies on nonlinear vibrational spectroscopy of intramolecular motion provided new insight into ultrafast hydrogen bond dynamics. However, our understanding of intermolecular dynamics of water is still limited. We theoretically investigated the intermolecular dynamics of liquid water in terms of two-dimensional infrared (2D IR) spectroscopy. The 2D IR spectrum of intermolecular frequency region is calculated by using the equilibrium and nonequilibrium hybrid molecular dynamics method. We find the ultrafast loss of the correlation of the libration motion with the time scale of approximately . It is also found that the energy relaxation from the libration motion to the low frequency motion takes place with the time scale of about . We analyze the effect of the hindered translation motion on these ultrafast dynamics. It is shown that both the frequency modulation of libration motion and the energy relaxation from the libration to the low frequency motion significantly slow down in the absence of the hindered translation motion. The present result reveals that the anharmonic coupling between the hindered translation and libration motions is essential for the ultrafast relaxation dynamics in liquid water.
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Research Article| April 21 2008
Ultrafast intermolecular dynamics of liquid water: A theoretical study on two-dimensional infrared spectroscopy
Shinji Saito a)
1Department of Theoretical and Computational Molecular Science,
Institute for Molecular Science, Myodaiji, Okazaki, Aichi 444-8585,
The Graduate University for Advanced Studies, Myodaiji, Okazaki, Aichi 444-8585,
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Takuma Yagasaki, Shinji Saito; Ultrafast intermolecular dynamics of liquid water: A theoretical study on two-dimensional infrared spectroscopy. J. Chem. Phys. 21 April 2008; 128 (15): 154521. https://doi.org/10.1063/1.2903470
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