Acoustic and relaxation processes in supercooled o-ter-phenyl by optical-heterodyne transient grating experiment

Details Acoustic and relaxation processes in supercooled o-ter-phenyl by optical-heterodyne transient grating experiment Acoustic and relaxation processes in supercooled o-ter-phenyl by optical-heterodyne transient grating experiment

2001-06-29

arxiv.org/abs/cond-mat/0106643v1

Physical Review E, VOLUME 64 (2001) 061504

Physics

Condensed Matter

Disordered Systems and Neural Networks

Scientific paper

10.1103/PhysRevE.64.061504

The dynamics of the fragile glass-forming o-ter-phenyl is investigated by time-resolved transient grating experiment with an heterodyne detection technique in a wide temperature range. We investigated the dynamics processes of this glass-former over more then 6 decades in time with an excellent signal/noise. Acoustic, structural and thermal relaxations have been clearly identify and measured in a time-frequency window not covered by previous spectroscopic investigations. A detailed comparison with the density response function, calculated on the basis of generalized hydrodynamics model, has been worked out.

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