Nonharmonic transverse vibration of the H-bonded molecules and the THz spectra in ice and water

The suggested TV-dielectric relaxation mechanism allows us: (a) to remove the THz 'deficit' of loss ε″ inherent in previous theoretical studies; (b) to explain the THz loss and absorption spectra in supercooled (SC) water; and (c) to describe, in agreement with the experiment, the low- and high-frequency tails of the two bands of ice H2O located in the range 10…300 cm− 1. Specific THz dielectric properties of SC water are ascribed to association of water molecules, revealed in our study by transverse vibration of HB charged molecules.