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The Proton Density of States in Confined Water (H2O)

Journal Article · · International Journal of Molecular Sciences (Online)
DOI:https://doi.org/10.3390/ijms20215373· OSTI ID:1572573

The hydrogen density of states (DOS) in confined water has been probed by inelastic neutron scattering spectra in a wide range of its P–T phase diagram. The liquid–liquid transition and the dynamical crossover from the fragile (super-Arrhenius) to strong (Arrhenius) glass forming behavior have been studied, by taking into account the system polymorphism in both the liquid and amorphous solid phases. The interest is focused in the low energy region of the DOS ( E < 10 meV) and the data are discussed in terms of the energy landscape (local minima of the potential energy) approach. In this latest research, we consider a unit scale energy (EC) linked to the water local order governed by the hydrogen bonding (HB). All the measured spectra, scaled according to such energy, evidence a universal power law behavior with different exponents ( γ ) in the strong and fragile glass forming regions, respectively. In the first case, the DOS data obey the Debye squared-frequency law, whereas, in the second one, we obtain a value predicted in terms of the mode-coupling theory (MCT) ( γ ≃ 1.6 ).

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-90ER45429
OSTI ID:
1572573
Alternate ID(s):
OSTI ID: 1800716
Journal Information:
International Journal of Molecular Sciences (Online), Journal Name: International Journal of Molecular Sciences (Online) Journal Issue: 21 Vol. 20; ISSN IJMCFK; ISSN 1422-0067
Publisher:
MDPI AGCopyright Statement
Country of Publication:
Switzerland
Language:
English

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