http://www.cnr.it/ontology/cnr/individuo/prodotto/ID612

Supercooled water relaxation dynamics probed with heterodyne transient grating experiments (Articolo in rivista)

Type

Label

Supercooled water relaxation dynamics probed with heterodyne transient grating experiments (Articolo in rivista) (literal)

Anno

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

Alternative label

Taschin, A; Bartolini, P; Eramo, R; Torre, R (2006)
Supercooled water relaxation dynamics probed with heterodyne transient grating experiments
in Physical review. E, Statistical, nonlinear, and soft matter physics (Print)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Pagina inizio

Pagina fine

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

Rivista

Note

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Univ Florence, European Lab Nonlinear Spectroscopy, I-50019 Florence, Italy; Univ Roma La Sapienza, INFM, CRS Soft Matter, I-00185 Rome, Italy; Univ Florence, Dipartimento Fis, I-50019 Florence, Italy (literal)

Titolo

Supercooled water relaxation dynamics probed with heterodyne transient grating experiments (literal)

Abstract

We report results from a heterodyne-detected transient grating experiment on liquid and supercooled water in a wide temperature range, from -17.5 to 90 degrees C. The measured signal covers an extremely large time window with an excellent signal-to-noise ratio that enables the investigation in a single experiment of the sound speed and attenuation, thermal diffusivity, and temperature dependence of the dielectric constant. The experimental data clearly show the effect of the density and the temperature fluctuations on the water dielectric function. In order to describe the experimental results, we introduce a comprehensive hydrodynamic model taking into account the coupled density and temperature variables and their relevance in the definition of the spontaneous and forced dielectric variations. We use this model to describe the measured signal in transient grating experiments, including the heating and the electrostrictive sources produced by the laser excitation. The fitting procedure enables the safe extraction of several dynamic proprieties of liquid and supercooled water: the sound velocity and its damping, the thermal diffusivity, and the ratio between the dielectric thermodynamic derivatives. The measured parameters are compared to the literature data and discussed in the complex scenario of water physics. (literal)

Prodotto di