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Consistent Anisotropic Repulsions for Simple Molecules

Sorin Bastea, Francis H. Ree

cond-mat.mtrl-sciarXiv:cond-mat/0012023

Abstract

We extract atom-atom potentials from the effective spherical potentials that suc cessfully model Hugoniot experiments on molecular fluids, e.g., O2 and N2. In the case of O2 the resulting potentials compare very well with the atom-atom potentials used in studies of solid-state propertie s, while for N2 they are considerably softer at short distances. Ground state (T=0K) and room temperatu re calculations performed with the new N-N potential resolve the previous discrepancy between experimental and theoretical results.

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