The ion dynamics of a saturated lithium ammonia solution was investigated by inelastic neutron scattering with optimized resolution. The experimental dispersion curve and mode damping, here carefully probed in a wave-vector range extending well below and above 1 A−1, display visible anomalies around 0.8 A−1. We relate the dispersion relation anomaly to the shape of the electron gas dielectric function, which screens the ion-ion potential in a way peculiar of the low electron density of the system. The increase of the damping around 0.8 A−1 also supports the presence of a new decay channel for the collective excitations. An interpretation of these effects, based on the low electron-density properties of the lithium-ammonia solution, is proposed.

Collective modes in a saturated lithium-ammonia solution as a probe of the response of the low-density homogeneous electron gas / C. Petrillo; F. Sacchetti; E. Guarini; L. E. Bove; and F. Demmel. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 84:(2011), pp. 094206-1-094206-6. [10.1103/PhysRevB.84.094206]

Collective modes in a saturated lithium-ammonia solution as a probe of the response of the low-density homogeneous electron gas

GUARINI GRISALDI TAJA O DEL TAJA, ELEONORA
Writing – Original Draft Preparation
;
2011

Abstract

The ion dynamics of a saturated lithium ammonia solution was investigated by inelastic neutron scattering with optimized resolution. The experimental dispersion curve and mode damping, here carefully probed in a wave-vector range extending well below and above 1 A−1, display visible anomalies around 0.8 A−1. We relate the dispersion relation anomaly to the shape of the electron gas dielectric function, which screens the ion-ion potential in a way peculiar of the low electron density of the system. The increase of the damping around 0.8 A−1 also supports the presence of a new decay channel for the collective excitations. An interpretation of these effects, based on the low electron-density properties of the lithium-ammonia solution, is proposed.
2011
84
094206-1
094206-6
C. Petrillo; F. Sacchetti; E. Guarini; L. E. Bove; and F. Demmel
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/531456
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