Abstract
Clusters of seven identical particles, bound by pairwise Morse potentials, simulated at constant energy, exhibit zones of dynamic coexistence of solid-like and liquid-like forms if the range parameter ρ0 = βr0 of the potential is large, corresponding to a short-range pair interaction. However no such phase coexistence occurs for longer-range Morse potentials, according to the criterion of bimodality (or unimodality, for no coexistence) of the distribution of short-time average vibrational temperatures. The difference is due to the smoother topography of the multidimensional potential surface generated by the longer-range pair potentials, particularly in the higher-energy reaches of that surface.
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