THERMODYNAMIC PROPERTIES OF NITROGEN FLUID AT HIGH-TEMPERATURES AND PRESSURES

The Monte-Carlo method in the atom-atom approximation was used for calculation of the internal energy and pressure of molecular nitrogen at temperatures of up to 9000 K and densities characteristic of the shock adiabat. Use was made of the atomic interaction potential determined by the scattering of molecular beams. The influence of electron excitation and nonrigidity of molecules was studied. It is shown that it is necessary to take into account the additional contribution to the pressure associated with the effect of the field of intermolecular forces on intramolecular motion, which may contribute up to 10% of the total pressure.