Volume 50, Number 2, April II 2000
|Page(s)||189 - 195|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Phonon-like and single-particle dynamics in liquid lithium
Università di Trento and Istituto Nazionale
di Fisica della Materia I-38100, Trento, Italy
2 Istituto di Elettronica Quantistica, Consiglio Nazionale delle Ricerche I-50127, Firenze, Italy
3 European Synchrotron Radiation Facility - B.P. 220 F-38043 Grenoble, Cedex France
4 Università di L'Aquila and Istituto Nazionale di Fisica della Materia I-67100, L'Aquila, Italy
Accepted: 31 January 2000
The dynamic structure factor, S(Q,E), of liquid lithium () has been remeasured by inelastic X-ray scattering (IXS) in an extended momentum transfer region (Q = 1.4–) and with improved energy resolution (down to 1.5 meV). These new data on such prototypical simple liquid allow to observe the full evolution with Q from a phonon-like collective mode towards the single-particle dynamics. As a function of Q, one finds: i) at low Q's, a sound mode with a positive dispersion of the sound velocity, ii) at intermediate Q's, excitations whose energy oscillates similarly to phonons in the crystal Brillouin zones, and iii) at high Q's, the S(Q,E) approaches a Gaussian shape, indicating that the single-particle dynamics has been reached.
PACS: 61.25.Mv – Liquid metals and alloys / 61.10.Eq – X-ray scattering (including small-angle scattering) / 61.20.Ne – Structure of simple liquids
© EDP Sciences, 2000
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