Abstract
This work describes a procedure for the numerical calculation of third virial coefficients of simple linear molecules. The method is applied to nitrogen using a site–site model pair-potential and the triple dipole term. Values of volumetric and acoustic second and third virial coefficients of nitrogen are reported over a wide range of temperature and compared with experimental data of several authors. The effect of including the quadrupole–quadrupole energy to the pair potential is investigated and the results suggest that the contributions of the quadrupole moment to second and third virial coefficients are non-negligible at low temperatures.
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