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- W2487457487 abstract "The complexity of the physical properties of liquid water is largely determined by the presence of a three-dimensional hydrogen bond (HB) network. The HB’'s undergo continuous transformations that occur on ultrafast timescales. The molecular vibrations are especially sensitive to the presence of the HB network. For example, the spectrum of the OH-stretch vibrational mode is substantially broadened and shifted towards lower frequencies if the OH-group is involved in the HB. Therefore, the microscopic structure and the dynamics of water are expected to manifest themselves in the IR vibrational spectrum, and, therefore, can be studied by methods of ultrafast infrared spectroscopy. It has been shown in a number of ultrafast spectroscopic experiments and computer simulations that dephasing dynamics of the OH-stretch vibrations of water molecules in the liquid phase occurs on sub-picosecond timescales. The technique of photon echo peak shift (EPS) allows obtaining the most direct information about the frequency fluctuation correlation function. This chapter presents a study of ultrafast dynamics in liquid water employing heterodyne-detected TG and EPS techniques. Heterodyne detection allows one to separate the genuine photon echo signal that contains information on water dynamics, from thermal effects. The analysis of the experimental EPS data that includes thermal effects yields a 700-fs time constant for the slowest component. This value is in perfect agreement with our previous findings from heterodyne-detected photon echo experiments." @default.
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- W2487457487 date "2004-01-01" @default.
- W2487457487 modified "2023-09-25" @default.
- W2487457487 title "2D photon-echo spectroscopy of hydrogen-bond dynamics in liquid water" @default.
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- W2487457487 doi "https://doi.org/10.1016/b978-044451656-5/50032-3" @default.
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