Reorientation of the H2O cage studied by terahertz time-domain spectroscopy

Yu, B. L.; Yang, Y.; Zeng, F.; Xin, X.; Alfano, R. R.
February 2005
Applied Physics Letters;2/7/2005, Vol. 86 Issue 6, p061912
Academic Journal
The terahertz absorption spectrum of a thin film of liquid H2O of ∼14 μm thickness showed a clear absorption mode at 1.56 THz (∼53 cm-1). This mode is attributed to the bending motion of the intermolecular hydrogen-bond coordinate in a water cage. The dielectric relaxation times of a slow τ1∼9 ps and a fast τ2∼0.2 ps component (0.4–2.0 THz) were determined using a double Debye dielectric model.


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