Methane–methane isotropic interaction potential from total differential cross sections

Total differential cross sections (DCS) for methane–methane scattering at three collision energies were determined using the crossed molecular beams technique. These DCS’s were used along with literature viscosity and second virial coefficient data to determine a spherical methane–methane interaction potential energy function. The potential has a zero crossing point σ of 3.62 Å, a well depth ε of 200 K, and an intermolecular separation at the minimum rm of 4.02 Å.