Abstract
We present a simple model which estimates the influence of quantum effects from molecularvibrations on the equation of state of water under high pressures and temperatures. Thismodel is combined with an ab initio equation of state of water generated by quantummolecular dynamics (QMD) simulations employing density functional theory for theelectrons and a classical algorithm for the ions. We calculate the specific heat capacity aswell as the principal Hugoniot curve, especially the Hugoniot temperature, in accordancewith experiments.
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