The He–N2 anisotropic Van der Waals potential. Test of a simple model using state-to-state differential scattering cross-sections

摘要: For He–N2 the total and j= 0 → 2, 1 3 rotationally inelastic differential cross-sections have been measured at a collision energy of Ecm= 27.3 meV centre-of-mass angles between 5 50°. These new data used to test validity an anisotropic potential recently calculated using model Tang Toennies. Theoretical close-coupling based on are found be in good agreement with data. By studying effect small modifications it has possible estimate that predicts anisotropy only negligible error but understimates well depth spherical by ca. 20%.