Observation of Single Transits in Supercooled Monatomic Liquids

Details Observation of Single Transits in Supercooled Monatomic Liquids Observation of Single Transits in Supercooled Monatomic Liquids

2004-09-23

arxiv.org/abs/cond-mat/0409628v1

Phys. Rev. E 64, 011205 (2001)

Physics

Condensed Matter

Materials Science

19 pages, 8 figures

Scientific paper

10.1103/PhysRevE.64.011205

A transit is the motion of a system from one many-particle potential energy valley to another. We report the observation of transits in molecular dynamics (MD) calculations of supercooled liquid argon and sodium. Each transit is a correlated simultaneous shift in the equilibrium positions of a small local group of particles, as revealed in the fluctuating graphs of the particle coordinates versus time. This is the first reported direct observation of transit motion in a monatomic liquid in thermal equilibrium. We found transits involving 2 to 11 particles, having mean shift in equilibrium position on the order of 0.4 R_1 in argon and 0.25 R_1 in sodium, where R_1 is the nearest neighbor distance. The time it takes for a transit to occur is approximately one mean vibrational period, confirming that transits are fast.

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