Abstract
Inelastic neutron scattering data on liquid 7Li at 470 K are presented. The results from two measurements are combined: the first with neutrons of 20 meV and a resolution at the detectors of 1.3 meV, the second with 525 meV neutrons and 18 meV resolution. This resolution enables one to investigate short-wavelength sound modes over a wavevector range 10 < κ < 33 nm −1. The data are analyzed in terms of extended hydrodynamic modes and the sound dispersion ω s( κ) over this entire κ-range are determined. The data indicate that very short wavelength sound modes do exist up to at least κ = 33 nm −1. The position of the top of the longitudinal current correlation function deviates significantly from ω s( κ). The present data confirm recent inelastic X-ray scattering experiments on liquid lithium as well as a neutron scattering experiment on liquid cesium.
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