Towards an intermolecular potential for nitrogen

An intermolecular pair potential energy function has been developed for nitrogen which is able to reconcile theoretical results for the system with experimental data for various bulk properties. The long and short range forms of the potential are known from quantum mechanical calculations. Modifications to the quadrupole-quadrupole energy due to electron charge overlap effects have been included. In the well region, many different representations have been studied and have been assessed by fitting to experimental data, chiefly for the low temperature lattice properties and second virial coefficients. A number of functions have been derived which are able to reproduce the available information within experimental error. Corrections for non-additive three body terms have been included in calculating the lattice properties, and the first order quantum corrections to the virial coefficients were also included. The dilute gas shear viscosity (based on the Monchick-Mason approximation) was also calculated and u...