Molecular Force Parameters through Thermal Diffusion to Ensure the Model Independency of Column Calibration Factor

Abstract

Using Ar 36 –Ar 40 as calibrating gas, the simultaneous determination of thermal diffusion factors α T 's at two available experimental temperatures as well as the prediction of pressure dependence of ln q e at an intermediate temperature is possible for some isotopic inert gas mixtures in terms of column calibration factor F s (CCF) of a given column. The variation of α T with \bar T is then used to estimate the force parameters of the molecules only to ensure the reliability of the proposed temperature dependence of α T . The experimental α T 's due to Maxwell and Slieker shape factors are also calculated for comparison with those by the CCF method as well as by theoretical ones based on elastic collisions among the molecules. It seems that α T 's by CCF method play an important role in determining the force parameters of molecules indicating thereby the model independency of F s as a sensitive α T measuring parameter.