Abstract
The adiabatic sound velocity of liquid argon is calculated by means of classical molecular dynamics simulations via the COMPASS force field, at the temperature of 388 K and the pressure range of 0.5–2.0 GPa. The isothermal sound velocity of liquid argon is obtained from the fluctuations of the supercell volume via Fluctuation Formula. Then, the adiabatic sound velocity is calculated from isothermal sound velocity by the Landau–Placzek ratio derived from the dynamic structure factor of the system. The calculated adiabatic sound velocities of liquid argon are in good agreement with the former Brillouin scattering measurements.
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