TESTING THE MASON-MONCHICK APPROXIMATION FOR TRANSPORT-PROPERTIES OF CO

Full classical trajectory calculations at temperatures between 77 and 1000 K for CO-CO collisions using the potential energy surface of van der Pol, van der Avoird and Wormer have been used to test the Mason-Mo nchick approximation values for the first- and second-order expression s for traditional transport properties: diffusion, viscosity and therm al conductivity. While results of useful accuracy can be obtained for part of the second-order corrections, the errors for these transport p roperties in first order are much larger than those seen for N-2-N-2. Hence this approximation may not be reliable for rotor-rotor collision s.