We study the temperature behavior of the first four peaks of the oxygen-oxygen radial distribution function of water, simulated by the TIP4P/2005, MB-pol, TIP5P, and SPC/E models and compare to experimental X-ray diffraction data, including a new measurement which extends down to 235 K [H. Pathak et al., J. Chem. Phys. 150, 224506 (2019)]. We find the overall best agreement using the MB-pol and TIP4P/2005 models. We observe, upon cooling, a minimum in the position of the second shell simulated with TIP4P/2005 and SPC/E potentials, located close to the temperature of maximum density. We also calculated the two-body entropy and the contributions coming from the first, second, and outer shells to this quantity. We show that, even if the main contribution comes from the first shell, the contribution of the second shell can become important at low temperature. While real water appears to be less ordered at short distance than obtained by any of the potentials, the different water potentials show more or less order compared to the experiments depending on the considered length-scale.
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28 July 2019
Research Article|
July 25 2019
Radial distribution functions of water: Models vs experiments
Special Collection:
Chemical Physics of Supercooled Water
Gaia Camisasca
;
Gaia Camisasca
a)
Department of Physics, AlbaNova University Center, Stockholm University
, SE-10609 Stockholm, Sweden
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Harshad Pathak
;
Harshad Pathak
Department of Physics, AlbaNova University Center, Stockholm University
, SE-10609 Stockholm, Sweden
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Kjartan Thor Wikfeldt
;
Kjartan Thor Wikfeldt
b)
Department of Physics, AlbaNova University Center, Stockholm University
, SE-10609 Stockholm, Sweden
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Lars G. M. Pettersson
Lars G. M. Pettersson
c)
Department of Physics, AlbaNova University Center, Stockholm University
, SE-10609 Stockholm, Sweden
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a)
Electronic mail: gaia.camisasca@fysik.su.se
b)
Present address: PDC Center for High Performance Computing, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
c)
Electronic mail: lgm@fysik.su.se
Note: This paper is part of a JCP Special Topic on Chemical Physics of Supercooled Water.
J. Chem. Phys. 151, 044502 (2019)
Article history
Received:
April 21 2019
Accepted:
June 27 2019
Citation
Gaia Camisasca, Harshad Pathak, Kjartan Thor Wikfeldt, Lars G. M. Pettersson; Radial distribution functions of water: Models vs experiments. J. Chem. Phys. 28 July 2019; 151 (4): 044502. https://doi.org/10.1063/1.5100871
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