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.
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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) |
@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 }