HIGH-FREQUENCY DYNAMICS OF GLASS-FORMING LIQUIDS AT THE GLASS-TRANSITION

Citation
C. Masciovecchio et al., HIGH-FREQUENCY DYNAMICS OF GLASS-FORMING LIQUIDS AT THE GLASS-TRANSITION, Physical review letters, 80(3), 1998, pp. 544-547
Citations number
18
Categorie Soggetti
Physics
Journal title
ISSN journal
00319007
Volume
80
Issue
3
Year of publication
1998
Pages
544 - 547
Database
ISI
SICI code
0031-9007(1998)80:3<544:HDOGLA>2.0.ZU;2-X
Abstract
The dynamic structure factor of the glass formers glycerol, o-terpheny l, and n-butyl-benzene has been studied by inelastic x-ray scattering across the liquid-glass transition. Data taken at selected temperature s in the 1-8 nm(-1) momentum transfer (Q) range show a propagating sou nd like mode in both liquid and glass phases. The energy of this mode, studied at fixed Q (approximate to 2 nm(-1)) on a fine temperature gr id, shows a cusp behavior in a region either comparable or higher than the macroscopic structural arrest temperature T-c. This suggests the existence of a correlation between the glass structure and the arrest taking place at the molecular scale.