Crystal-like high frequency phonons in the amorphous phases of solid water

Abstract

The high frequency dynamics of low- (LDA) and high-density amorphous-ice (HDA) and of cubic ice (I_c) has been measured by inelastic X-ray Scattering (IXS) in the 1-15 nm^{-1} momentum transfer (Q) range. Sharp phonon-like excitations are observed, and the longitudinal acoustic branch is identified up to Q = 8nm^{-1} in LDA and I_c and up to 5nm^{-1} in HDA. The narrow width of these excitations is in sharp contrast with the broad features observed in all amorphous systems studied so far. The "crystal-like" behavior of amorphous ices, therefore, implies a considerable reduction in the number of decay channels available to sound-like excitations which is assimilated to low local disorder.

arXiv comment4 pages, 3 figures

References in corpus (2)

• Is there a liquid-liquid phase transition in supercooled water ?
• Ice XII in its second regime of metastability

Cited by in corpus (8)

• On the nature of amorphous polymorphism of water
• Link between the diversity, heterogeneity and kinetic properties of amorphous ice structures
• The ${\omega }^3$ scaling of the vibrational density of states in quasi-2D nanoconfined solids
• Absence of molecular mobility on nano-second time scales in amorphous ice phases
• On the heterogeneous character of water's amorphous polymorphism
• IRFEL Selective Irradiation of Amorphous Solid Water: from Dangling to Bulk Modes
• Ice phonon spectra and Bayes inference: a gateway to a new understanding of terahertz sound propagation in water
• Ice emission and the redshifts of submillimeter sources