Breakup of the Hydrogen Bond Network In Water:The Momentum Distribution of the Protons

Details Breakup of the Hydrogen Bond Network In Water:The Momentum Distribution of the Protons Breakup of the Hydrogen Bond Network In Water:The Momentum Distribution of the Protons

2003-11-27

arxiv.org/abs/cond-mat/0311628v1

Physics

Condensed Matter

6 pages, 3 figures, 2 tables

Scientific paper

Neutron Compton Scattering measurements presented here of the momentum distribution of hydrogen in water at temperatures slightly below freezing to the supercritical phase show a dramatic change in the distribution as the hydrogen bond network becomes more disordered. Within a single particle interpretation, the proton moves from an essentially harmonic well in ice to a slightly anharmonic well in room temperature water, to a deeply anharmonic potential in the supercritical phase that is best described by a double well potential with a separation of the wells along the bond axis of about .3 Angstroms. Confining the supercritical water in the interstices of a C60 powder enhances this anharmonicity. The changes in the distribution are consistent with gas phase formation at the hydrophobic boundaries.

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