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A short survey on recent inelastic scattering work on liquid alkali metals is given. The classification of liquid alkalis as "simple liquids" is questioned from analysing experimental data measured within the full liquid range from melting point conditions up to the immediate vicinity of the liquid vapour critical point. Depending on density, the particle dynamics passes through several characteristic domains. At sufficiently high density where the electron gas determines the interparticle interactions, the motional behaviour is rather solid-like and essentially two relaxation mechanisms are needed to correctly account for the single particle as well as for the collective dynamics. At sufficiently reduced density, electron localisation must be taken into account favouring the formation of molecular species. Their internal degrees of freedom resulting from this chemical variation gradually determine the shape of the scattering law. [ABSTRACT FROM AUTHOR]

The construction project of the novel thermal neutron Brillouin spectrometer (BRISP) is entering its commissioning period. After a brief review of the scientific motivation and the technical components of the instrument, we present here a historical overview of the installation steps that have gradually brought such a difficult project into the present important phase. [ABSTRACT FROM AUTHOR]

Quasi-elastic neutron scattering measurements of liquid germanium were carried out at 1000 and 1500°C, using the inverted geometry inelastic neutron spectrometer, LAM-40. The dynamic structure factor, S ( Q , E ), is obtained over a wide momentum transfer region from 0.6 to 5.1 Å -1 . [ABSTRACT FROM AUTHOR]