The structure of liquid water up to 360 MPa from x-ray diffraction measurements using a high Q-range and from molecular simulation
Abstract
X-ray diffraction measurements of liquid water are reported at pressures up to 360 MPa corresponding to a density of 0.0373 molecules per Å3. The measurements were conducted at a spatial resolution corresponding to Qmax = 16 Å-1. The method of data analysis and measurement in this study follows the earlier benchmark results reported for water under ambient conditions having density of 0.0333 molecules per Å3 and Qmax = 20 Å-1 [J Chem Phys 138, 074506 (2013)]1 and at 70°C having density of 0.0327 molecules per Å3 and Qmax = 20 Å-1. [J Chem Phys 141, 214507 (2014)]2 The structure of water is very different at these three different T and P state points and thus they provide basis for evaluating the fidelity of molecular simulation. Measurements show that at 360 MPa, the 4 waters residing in the region between 2.3-3 Å are nearly unchanged: the peak position, shape and coordination number are nearly identical to their values under ambient conditions. However, in the region above 3 Å, large structural changes occur with the collapse of the well-defined 2nd shell and shifting of higher shells to shorter distances. The measured structure is compared to simulated structure using intermolecular potentials described bymore »
- Authors:
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1337266
- Report Number(s):
- PNNL-SA-115506
Journal ID: ISSN 0021-9606; KC0301050
- DOE Contract Number:
- AC05-76RL01830
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 144; Journal Issue: 13; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Skinner, L. B., Galib, M., Fulton, J. L., Mundy, C. J., Parise, J. B., Pham, V. -T., Schenter, G. K., and Benmore, C. J. The structure of liquid water up to 360 MPa from x-ray diffraction measurements using a high Q-range and from molecular simulation. United States: N. p., 2016.
Web. doi:10.1063/1.4944935.
Skinner, L. B., Galib, M., Fulton, J. L., Mundy, C. J., Parise, J. B., Pham, V. -T., Schenter, G. K., & Benmore, C. J. The structure of liquid water up to 360 MPa from x-ray diffraction measurements using a high Q-range and from molecular simulation. United States. https://doi.org/10.1063/1.4944935
Skinner, L. B., Galib, M., Fulton, J. L., Mundy, C. J., Parise, J. B., Pham, V. -T., Schenter, G. K., and Benmore, C. J. 2016.
"The structure of liquid water up to 360 MPa from x-ray diffraction measurements using a high Q-range and from molecular simulation". United States. https://doi.org/10.1063/1.4944935.
@article{osti_1337266,
title = {The structure of liquid water up to 360 MPa from x-ray diffraction measurements using a high Q-range and from molecular simulation},
author = {Skinner, L. B. and Galib, M. and Fulton, J. L. and Mundy, C. J. and Parise, J. B. and Pham, V. -T. and Schenter, G. K. and Benmore, C. J.},
abstractNote = {X-ray diffraction measurements of liquid water are reported at pressures up to 360 MPa corresponding to a density of 0.0373 molecules per Å3. The measurements were conducted at a spatial resolution corresponding to Qmax = 16 Å-1. The method of data analysis and measurement in this study follows the earlier benchmark results reported for water under ambient conditions having density of 0.0333 molecules per Å3 and Qmax = 20 Å-1 [J Chem Phys 138, 074506 (2013)]1 and at 70°C having density of 0.0327 molecules per Å3 and Qmax = 20 Å-1. [J Chem Phys 141, 214507 (2014)]2 The structure of water is very different at these three different T and P state points and thus they provide basis for evaluating the fidelity of molecular simulation. Measurements show that at 360 MPa, the 4 waters residing in the region between 2.3-3 Å are nearly unchanged: the peak position, shape and coordination number are nearly identical to their values under ambient conditions. However, in the region above 3 Å, large structural changes occur with the collapse of the well-defined 2nd shell and shifting of higher shells to shorter distances. The measured structure is compared to simulated structure using intermolecular potentials described by both first-principles methods (revPBE-D3) and classical potentials (TIP4P/2005 and mW). The DFT-based, revPBE-D3 provides the best overall representation of the ambient, high-temperature and high-pressure data while the TIP4P/2005 also captures the densification mechanism, whereby the non-bonded 5th nearest neighbor molecule, which encroaches the 1st shell at ambient pressure, is pushed further into the local tetrahedral arrangement at higher pressures by the more distant molecules filling the void space in the network between the 1st and 2nd shells. Acknowledgments: Thanks to Rick Spence and Doug Robinson for support with the beamline equipment at the Advanced Photon Source. The helpful comments of Valeria Molinero are acknowledged. This work was supported by the U.S. Department of Energy (DOE) office of Basic Energy Sciences grant Number BES DE-FG02-09ER46650 which supported, MD simulations, data analysis and manuscript preparation (LBS and JBP). DOE contract DE-AC02-06CH11357 supports operation of the Advanced Photon Source at Argonne National Laboratory. Work by JLF, MG, GSK and CJM was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences & Biosciences. Pacific Northwest National Laboratory (PNNL) is a multiprogram national laboratory operated for DOE by Battelle.},
doi = {10.1063/1.4944935},
url = {https://www.osti.gov/biblio/1337266},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 13,
volume = 144,
place = {United States},
year = {Thu Apr 07 00:00:00 EDT 2016},
month = {Thu Apr 07 00:00:00 EDT 2016}
}
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