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Acoustic and relaxation processes in supercooled orthoterphenyl by optical-heterodyne transient grating experiment.

Authors :
Torre R
Taschin A
Sampoli M
Source :
Physical review. E, Statistical, nonlinear, and soft matter physics [Phys Rev E Stat Nonlin Soft Matter Phys] 2001 Dec; Vol. 64 (6 Pt 1), pp. 061504. Date of Electronic Publication: 2001 Nov 20.
Publication Year :
2001

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.

Details

Language :
English
ISSN :
1539-3755
Volume :
64
Issue :
6 Pt 1
Database :
MEDLINE
Journal :
Physical review. E, Statistical, nonlinear, and soft matter physics
Publication Type :
Academic Journal
Accession number :
11736188
Full Text :
https://doi.org/10.1103/PhysRevE.64.061504