Abstract
The Car-Parrinello nonempirical molecular dynamics method was used to obtain radial distribution functions of water at the critical point and in six sub- and supercritical states. The influence of changes in state parameters on radial distribution functions was found to be much stronger close to the saturation curve than in the region of high pressures. The reproduction of radial distribution functions by classical and quantum molecular dynamics methods was analyzed. The positions of radial distribution peaks and the ratios between their heights were found to be almost identical and to correspond to the experimental data, but, as concerns quantitative estimates of peak heights, the same contradictions are observed as between the data of various experimental studies.
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