Crossref journal-article
AIP Publishing
The Journal of Chemical Physics (317)
Abstract

The density and temperature dependence of the structural relaxation time (τ) in water was determined by inelastic ultraviolet scattering spectroscopy in the thermodynamic range (P=1–4000 bars, T=253–323 K), where several water anomalies take place. We observed an activation (Arrhenius) temperature dependence of τ at constant density and a monotonic density decrease at constant temperature. The latter trend was accounted for by introducing a density-dependent activation entropy associated to water local structure. The combined temperature and density behavior of τ indicates that differently from previous results, in the probed thermodynamic range, the relaxation process is ruled by a density-dependent activation Helmholtz free energy rather than a simple activation energy. Finally, the extrapolation of the observed phenomenology at lower temperature suggests a substantial agreement with the liquid-liquid phase transition hypothesis.

Bibliography

Bencivenga, F., Cimatoribus, A., Gessini, A., Izzo, M. G., & Masciovecchio, C. (2009). Temperature and density dependence of the structural relaxation time in water by inelastic ultraviolet scattering. The Journal of Chemical Physics, 131(14).

Authors 5
  1. F. Bencivenga (first)
  2. A. Cimatoribus (additional)
  3. A. Gessini (additional)
  4. M. G. Izzo (additional)
  5. C. Masciovecchio (additional)
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Dates
Type When
Created 15 years, 10 months ago (Oct. 8, 2009, 7:55 p.m.)
Deposited 2 years, 1 month ago (June 26, 2023, 12:26 a.m.)
Indexed 2 weeks, 4 days ago (Aug. 6, 2025, 8:41 a.m.)
Issued 15 years, 10 months ago (Oct. 8, 2009)
Published 15 years, 10 months ago (Oct. 8, 2009)
Published Online 15 years, 10 months ago (Oct. 8, 2009)
Published Print 15 years, 10 months ago (Oct. 14, 2009)
Funders 0

None

@article{Bencivenga_2009, title={Temperature and density dependence of the structural relaxation time in water by inelastic ultraviolet scattering}, volume={131}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.3243314}, DOI={10.1063/1.3243314}, number={14}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Bencivenga, F. and Cimatoribus, A. and Gessini, A. and Izzo, M. G. and Masciovecchio, C.}, year={2009}, month=oct }