POTENTIAL FUNCTIONS AND PARAMETERS FOR NE-N-2 AND AR-H-2 GAS-MIXTURES

The thermal diffusion factor, alpha(T), has been measured as a functio n of temperature and composition for the gas mixtures Ne-N-2 and Ar-H- 2 using the two-bulb method. The measurements covered the temperature range from about 325 to about 825 K and the composition range from 15% to 85% of the lighter component. The data have been analyzed accordin g to the (m-6-8) and LJ(12-6) potential models where the intermolecula r forces and the potential functions were determined for the two studi ed systems. The (m-6-8) parameters obtained were used to calculate the binary diffusion coefficients and these were compared with recent dif fusion data. It has been found that the present (m-6-8) potential func tions for the AU-H-2 system predict very well both of the thermal diff usion and the recent diffusion data with percentage deviation not exce eding 3% and the diffusion data of the Ne-N-2 system with maximum devi ation of about 1%. However, both the symmetric LJ(12-6) and (m-6-8) po tentials failed to explain the thermal diffusion data for the Ne-N-2 s ystem. A conclusion has been made for this state of affairs.