Based on recent experimental data that can be interpreted as indicating the presence of specific structures in liquid water, we build and optimize two structural models which we compare with the available experimental data. To represent the proposed high-density liquid structures, we use a model consisting of chains of water molecules, and for low-density liquid, we investigate fused dodecahedra as templates for tetrahedral fluctuations. The computed infrared spectra of the models are in very good agreement with the extracted experimental spectra for the two components, while the extracted structures from molecular dynamics (MD) simulations give spectra that are intermediate between the experimentally derived spectra. Computed x-ray absorption and emission spectra as well as the O–O radial distribution functions of the proposed structures are not contradicted by experiment. The stability of the proposed dodecahedral template structures is investigated in MD simulations by seeding the starting structure, and remnants found to persist on an ∼30 ps time scale. We discuss the possible significance of such seeds in simulations and whether they can be viable candidates as templates for structural fluctuations below the compressibility minimum of liquid water.
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21 July 2019
Research Article|
July 19 2019
A proposal for the structure of high- and low-density fluctuations in liquid water
Special Collection:
Chemical Physics of Supercooled Water
Gaia Camisasca
;
Gaia Camisasca
1
Department of Physics, AlbaNova University Center, Stockholm University
, S-106 91 Stockholm, Sweden
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Daniel Schlesinger
;
Daniel Schlesinger
2
Department of Environmental Science and Analytical Chemistry & Bolin Centre for Climate Research, Stockholm University
, 114 18 Stockholm, Sweden
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Iurii Zhovtobriukh;
Iurii Zhovtobriukh
1
Department of Physics, AlbaNova University Center, Stockholm University
, S-106 91 Stockholm, Sweden
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George Pitsevich
;
George Pitsevich
3
Belarusian State University
, Nezavisimosti Ave., 4, 220030 Minsk, Belarus
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Lars G. M. Pettersson
Lars G. M. Pettersson
a)
1
Department of Physics, AlbaNova University Center, Stockholm University
, S-106 91 Stockholm, Sweden
a)Author to whom correspondence should be addressed: lgm@fysik.su.se
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a)Author to whom correspondence should be addressed: lgm@fysik.su.se
Note: This paper is part of a JCP Special Topic on Chemical Physics of Supercooled Water.
J. Chem. Phys. 151, 034508 (2019)
Article history
Received:
April 21 2019
Accepted:
June 24 2019
Citation
Gaia Camisasca, Daniel Schlesinger, Iurii Zhovtobriukh, George Pitsevich, Lars G. M. Pettersson; A proposal for the structure of high- and low-density fluctuations in liquid water. J. Chem. Phys. 21 July 2019; 151 (3): 034508. https://doi.org/10.1063/1.5100875
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