The proton density of states in confined water (H2O)
Name
ijms-20-05373.pdf
Size
1.48 MB
Format
Adobe PDF
Checksum (MD5)
18b4bc4b837e653e7df4ebf21a7c79f7
Author(s)
Chen, Sow-Hsin
Corsaro, Carmelo
Mallamace, Francesco
Fazio, Enza
Mallamace, Domenico
Date Issued
October 29, 2019
Journal
International Journal of Molecular Sciences
Publisher
Multidisciplinary Digital Publishing Institute
Citation
Chen, Sow-Hsin, Carmelo Corsaro, Francesco Mallamace, Enza Fazio, and Domenico Mallamace, "The proton density of states in confined water (H2O)." International Journal of Molecular Sciences 20, 21 (2019): no. 5373 doi 10.3390/ijms20215373 ©2019 Author(s)
Version
Final published version
Abstract
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 ). Keywords: water; confined water; density of states; inelastic neutron scattering
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.3390/ijms20215373
