# The unusually low zero-point energy of ice II.

Ulpiani P., Romanelli G., Salzmann C., Sharif Z., Senesi R., Andreani C.

Comunicazione
II - Fisica della materia
GSSI Ex ISEF - Aula C - Martedì 24 h 17:30 - 19:30
Ice II is an unusual hydrogen-ordered phase, thermodynamically stable up to very high temperatures with respect to the other ice phases. The study of the hydrogen and oxygen dynamics is of great relevance for an accurate microscopic description of condensed water phases. Indeed, this elucidates the role of the hydrogen bond network through the hydrogen and oxygen mean kinetic energies, $\langle E_{k}\rangle$. Experimentally $\langle E_{k}\rangle$ is obtained from Deep Inelastic Neutron Scattering measurements. Using the VESUVIO spectrometer at ISIS neutron source, we show that ice II has the lowest $\langle E_{k}\rangle$ compared to a range of other ice phases.