title: Microscopic dynamics of liquid aluminum oxide.
abstract: Collective excitations have been observed in liquid aluminum oxide at high temperatures by combining a containerless sample environment with inelastic x-ray scattering. The excitation spectra show a well-defined triplet peak structure at lower wave vectors Q (1 to 6 nanometers-1) and a single quasi-elastic peak at higher Q. The high-Q spectra are well described by kinetic theory. The low-Q spectra require a frequency-dependent viscosity and provide previously unknown experimental constraints on the behavior of liquids at the interface between atomistic and continuum theory.
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA.
authors.forename: H
authors.initials: H
authors.lastname: Sinn
authors.forename: B
authors.initials: B
authors.lastname: Glorieux
authors.forename: L
authors.initials: L
authors.lastname: Hennet
authors.forename: A
authors.initials: A
authors.lastname: Alatas
authors.forename: M
authors.initials: M
authors.lastname: Hu
authors.forename: E E
authors.initials: EE
authors.lastname: Alp
authors.forename: F J
authors.initials: FJ
authors.lastname: Bermejo
authors.forename: D L
authors.initials: DL
authors.lastname: Price
authors.forename: M-L
authors.initials: ML
authors.lastname: Saboungi