Water spectra transverse vibration

Connection of Transverse Vibration (TV) with Water Spectrum... 

The TV-dielectric relaxation mechanism allows us to (i) remove the THz deficit of loss e" inherent in previous (see GT2) theoretical studies, (ii) explain the THz loss and absorption spectra in supercooled (SC) water, (iii) describe, in agreement with the experiment, the low- and high-frequency tails of the two bands of ice H20 located in the range 10-300 cm-1, and (iv) describe the nonresonance loss spectrum in ice in the submillimetric region of wavelengths. Specific THz dielectric properties of SC water are ascribed to association of water molecules, revealed in our study by transverse vibration of the HB charged molecules. 

The model described in this chapter can be applied to the calculation of the permittivity spectra in water in the broad frequency range 0-1000 cm-1 and to calculation of the ice far-IR spectra in the resonance region 50-1000 cm-1. As seen in Fig. 26 (curves I), in a nonresonance ice spectrum only the transverse-vibration mechanism (d) works. Indeed, we see from Fig. 24b that at v < 50 cm-1, namely in the submillimeter wavelength region and at lower frequencies, mechanisms a-c practically vanish. 

---