The structure of water around the compressibility minimum

L. B. Skinner, C. J. Benmore, J. C. Neuefeind, J. B. Parise

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Abstract

Here we present diffraction data that yield the oxygen-oxygen pair distribution function, gOO(r) over the range 254.2-365.9 K. The running O-O coordination number, which represents the integral of the pair distribution function as a function of radial distance, is found to exhibit an isosbestic point at 3.30(5) Å. The probability of finding an oxygen atom surrounding another oxygen at this distance is therefore shown to be independent of temperature and corresponds to an O-O coordination number of 4.3(2). Moreover, the experimental data also show a continuous transition associated with the second peak position in gOO(r) concomitant with the compressibility minimum at 319 K.

Original languageEnglish
Article number214507
JournalJournal of Chemical Physics
Volume141
Issue number21
DOIs
StatePublished - Dec 7 2014
Externally publishedYes

Funding

FundersFunder number
U.S. Department of EnergyDE-AC02-06CH11357

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