Acoustic and relaxation processes in supercooled orthoterphenyl by optical-heterodyne transient grating experiment
Year: 2001
Authors: Torre R., Taschin A., Sampoli M.
Autors Affiliation: INFM, Unita Firenze, I-50125 Florence, Italy; Univ Florence, LENS, I-50125 Florence, Italy; Univ Florence, Dipartimento Fis, I-50125 Florence, Italy; Univ Florence, Dipartimento Energet, Florence, Italy.
Abstract: The dynamics of the fragile glass-forming orthoterphenyl have been investigated by transient grating experiments with an heterodyne detection technique. We measured the relaxation processes of this glass former over more than six decades in time with an excellent signal-to-noise ratio. Acoustic, structural, and thermal relaxations have been clearly identified in a time-frequency window not covered by previous spectroscopic studies and their characteristic dynamic parameters have been measured as a function of temperature and wave vector. A detailed comparison with the density response function. calculated on the basis of generalized hydrodynamic model. has been worked out.
Journal/Review: PHYSICAL REVIEW E
Volume: 64 (6) Pages from: 61504-1 to: 61504-10
KeyWords: Stimulated Light-scattering; Mode-coupling Theory; Glass-forming Liquids; Ortho-terphenyl; T-c; Dynamics; Transition; SpectroscopyDOI: 10.1103/PhysRevE.64.061504ImpactFactor: 2.235Citations: 45data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-24References taken from IsiWeb of Knowledge: (subscribers only)
