Microshock wave propagation in molecular clusters

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Abstract
Microshock wave propagation in ArN (N=55–555) clusters generated by high-energy cluster-Pt surface impact (cluster velocities v=1–10 km s−1) is explored by molecular dynamics simulations. The gross features of the dynamics of the intracluster microshock wave propagation at this impact velocity range are not sensitive to the details of the repulsive potential (i.e., the Lennard-Jones or the exp-6 form). The propagation of the microshock within the cluster was quantified by the time dependence of the first moment of the total energy. A linear dependence between the microshock (compression) velocity us and the cluster impact velocity v is observed and for sufficiently large clusters (N≥321) us≊v. For large clusters (N≳321), the cluster Hugoniot temperature–pressure relations are qualitatively similar to those for the compression of macroscopic fluid Ar.

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