Analytical calculation of far infrared spectra of ice in terms of a molecular model

The composite hat-HO-CP model results in a smooth ε(ν) ice spectrum, which does not resemble the noise-like spectra of ice met in the known literature. The proposed theory satisfactorily agrees with the experimental ice spectrum measured at −7 °C. The calculated longitudinal optic-transverse optic (LO-TO) splitting occurring at ≈250 cm−1 qualitatively agrees with the measured data.