MOLECULAR-DYNAMICS MODELING OF THE HUGONIOT OF SHOCKED LIQUID DEUTERIUM

Using our previously-developed hydrogen tight-binding model, we perfor med equilibrium molecular dynamics simulations to obtain the internal energy and pressure of the deuterium fluid at 39 separate (density, te mperature) points. Our simulations are thought to represent the energe tics of fluid hydrogen accurately, including molecular dissociation. W e fit the thermodynamically-consistent simulation data with a virial e xpansion, obtaining a high-quality equation of state (EOS) fit. The fi tting data span the ranges 0.58 < rho(D)< 1.47 g/cm(3) and 3000 < Tau < 31 250 K, and the deduced EOS is thought to have a similar range of reliability. Our Hugoniot for shocked liquid deuterium shows a sharp r ise in pressure and temperature at around 0.65-0.70 g/cm(3). We compar e our theoretical Hugoniot to recent experimental and theoretical resu lts.