Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2000-02-03
Physics
Condensed Matter
Statistical Mechanics
12 pages, 2 figures
Scientific paper
Studies of the many-body potential surface of liquid sodium have shown that it consists of a great many intersecting nearly harmonic valleys, a large fraction of which have the same frequency spectra. This suggests that a sufficiently supercooled state of this system, remaining in a single valley, would execute nearly harmonic motion. To test this hypothesis, we have compared $\hat{Z}(t)$, the normalized velocity autocorrelation function, calculated from MD simulations to that predicted under the assumption of purely harmonic motion. We find nearly perfect agreement between the two, suggesting that the harmonic approximation captures all essential features of the motion.
Chisolm Eric D.
Clements Brad E.
Wallace Duane C.
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