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- W2019960012 abstract "The spectral substructure of the OH-stretching band of the isotopic mixture HDO in D2O is demonstrated in the temperature range of 273−343 K, using two-color IR spectroscopy with tuneable subpicosecond and picosecond pulses. We derive from time-resolved spectra three major components peaked at approximately 3330 cm-1 (I), 3400 cm-1 (II), and 3450−3500 cm-1 (III). In contrast to I and II, species III displays a distinct temperature dependence of position and bandwidth. The latter varies in the range 90−140 cm-1, representing inhomogeneous broadening above 290 K, as indicated by novel hole-burning observations with a hole width of 45 cm-1 and a lifetime of the holes of ≈1 ps. The species I−III are also characterized by different values of the reorientational time constant in the range of 3−15 ps, depending on temperature, and are attributed to different preferred local environments in the hydrogen-bonded network. Component I observed with decreasing amplitude up to 343 K is close to a frequency characteristic for the ice structure Ih and provides evidence for approximately tetrahedral local geometries in liquid water. From the measured cross-relaxation among the spectral species, a structural relaxation time of 1.5−0.8 ps is deduced in the range 273−343 K. The populational lifetime of the first excited state of the OH-stretching vibration of component II is measured to be 1.0 ± 0.2 ps at room temperature." @default.
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- W2019960012 date "1998-10-27" @default.
- W2019960012 modified "2023-10-16" @default.
- W2019960012 title "Local Substructures of Water Studied by Transient Hole-Burning Spectroscopy in the Infrared: Dynamics and Temperature Dependence" @default.
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- W2019960012 doi "https://doi.org/10.1021/jp980667w" @default.
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