Dynamics of monatomic liquids

Details Dynamics of monatomic liquids Dynamics of monatomic liquids

2004-09-24

arxiv.org/abs/cond-mat/0409652v1

J. Phys.: Condens. Matter 13, R739 (2001)

Physics

Condensed Matter

Statistical Mechanics

53 pages, 16 figures. Differs from published version in using American English spelling and grammar (published version uses Br

Scientific paper

10.1088/0953-8984/13/37/201

We present a theory of the dynamics of monatomic liquids built on two basic ideas: (1) The potential surface of the liquid contains three classes of intersecting nearly-harmonic valleys, one of which (the ``random'' class) vastly outnumbers the others and all whose members have the same depth and normal mode spectrum; and (2) the motion of particles in the liquid can be decomposed into oscillations in a single many-body valley, and nearly instantaneous inter-valley transitions called transits. We review the thermodynamic data which led to the theory, and we discuss the results of molecular dynamics (MD) simulations of sodium and Lennard-Jones argon which support the theory in more detail. Then we apply the theory to problems in equilibrium and nonequilibrium statistical mechanics, and we compare the results to experimental data and MD simulations. We also discuss our work in comparison with the QNM and INM research programs and suggest directions for future research.

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