Direct calculation of CH4-He interaction potential from the extended principle of corresponding states

The interaction potential energy between CH4 and He has been determined from the extended law of corresponding states for viscosity using the inversion technique. Lennard-lones (12-6) and BBMS potential functions have been checked as the initial model potentials required by the technique. The resulting potential energy from L-J potential is in excellent agreement with the one obtained from crossed molecular beam experimental results. The interaction potential energies from inversion reproduce the viscosity within 1%, the binary diffusion coefficient within 5%, and the thermal diffusion within 25%.