MEASUREMENTS OF INTERACTION 2ND VIRIAL-COEFFICIENTS OF BINARY-MIXTURES OF INERT-GASES AND GASES WITH LINEAR-MOLECULES AT TEMPERATURES RANGING FROM 296 TO 463 K

The interaction second virial coefficients of the mixtures Ar/CO, Ar/N -2, Ar/O-2, Ne/CO, Ne/N-2, and Ne/O-2 were measured from 296 K to 463 K, utilizing the expansion method and the temperature changing method. Improvements in the previously described apparatuses reduced systemat ical errors and provided more accurate measurements of the coefficient s. The experimental data were compared to calculations of interaction second virial coefficients based on modern potential energy surfaces. None of the previously reported potential energy surfaces was sufficie nt to account for the measured interaction second virial coefficients over our experimental temperature range from 296 K to 463 K.