The far-infrared spectrum of ice VIII

The far-infrared spectrum of ice VIII as recovered at ∼100 K and zero pressure has translational and rotational bands at 162 and 455 cm−1, respectively. They are undoubtedly due to the Eu translational vibration in the x, y plane and the Eu rotational vibration about the x, y axes. The correlation of the vibrations of ice VIII with the zone-center and -boundary vibrations of the centrosymmetric phase ice X is summarized.