Particle/Particle.C Neutral/Neutral.C Ion/Ion.C Electron/Electron.C Interaction/Interaction.C Stockmayer/Stockmayer.C Coulomb/Coulomb.C N64/N64.C CrossSection/CrossSection.C GasState/GasState.C diffusivityModel/diffusivityModel.C LIB = $(FOAM_USER_LIBBIN)/libdiffusivityModel