| Issue |
Europhys. Lett.
Volume 50, Number 2, April II 2000
|
|
|---|---|---|
| Page(s) | 189 - 195 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00253-5 | |
| Published online | 01 September 2002 | |
Phonon-like and single-particle dynamics in liquid lithium
1
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
Received:
22
October
1999
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.