Abstract
Here, we report the frequency-dependent spectrum of ice Ih in the range of 0.2-2THz. We confirm the presence of a feature that blue-shifts from around 1.55-1.65THz with a decreasing temperature from 260 to 160K. There is also a change in the trend of the refractive index of ice corresponding to a dispersion, which is also around 1.6THz. The features are reproduced in data acquired with three commercial terahertz time-domain spectrometers. Computer-simulated spectra assign the feature to lattice translations perpendicular to the 110 and 1̄10 planes of the ice Ih crystal. The feature's existence should be recognized in the terahertz measurements of frozen aqueous solution samples to avoid false interpretations.
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